[v5.15] KASAN: use-after-free Read in br_multicast_has_router_adjacent
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syzbot
May 5, 2026, 9:49:34 PM (8 days ago) May 5
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: ef251c45f1cd Linux 5.15.204
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1596e696580000
kernel config: https://syzkaller.appspot.com/x/.config?x=353ae28c40b35af5
dashboard link: https://syzkaller.appspot.com/bug?extid=b99962661ed5ca12a4a7
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bde897c3d01f/disk-ef251c45.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/51b2a5826cd1/vmlinux-ef251c45.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cb95a5a40121/bzImage-ef251c45.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b99962...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in br_multicast_has_router_adjacent+0x3b3/0x490 net/bridge/br_multicast.c:4820
Read of size 8 at addr ffff888022b6b9a8 by task kworker/u4:6/4281
CPU: 0 PID: 4281 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: bat_events batadv_mcast_mla_update
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
br_multicast_has_router_adjacent+0x3b3/0x490 net/bridge/br_multicast.c:4820
batadv_mcast_mla_rtr_flags_bridge_get net/batman-adv/multicast.c:204 [inline]
batadv_mcast_mla_rtr_flags_get net/batman-adv/multicast.c:233 [inline]
batadv_mcast_mla_flags_get net/batman-adv/multicast.c:257 [inline]
__batadv_mcast_mla_update net/batman-adv/multicast.c:876 [inline]
batadv_mcast_mla_update+0x527/0x3150 net/batman-adv/multicast.c:915
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Allocated by task 151:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
kmalloc_reserve net/core/skbuff.c:356 [inline]
pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1709
__skb_cow include/linux/skbuff.h:3406 [inline]
skb_cow_head include/linux/skbuff.h:3440 [inline]
batadv_skb_head_push+0x162/0x1f0 net/batman-adv/soft-interface.c:73
batadv_send_skb_packet+0xf7/0x5f0 net/batman-adv/send.c:86
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x698/0x840 net/batman-adv/bat_iv_ogm.c:1703
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Freed by task 151:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x6b8/0x800 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
kfree_skb_reason+0xaf/0x110 net/core/skbuff.c:776
kfree_skb include/linux/skbuff.h:1118 [inline]
__netif_receive_skb_core+0x3116/0x3690 net/core/dev.c:5525
__netif_receive_skb_one_core net/core/dev.c:5549 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5665
process_backlog+0x370/0x790 net/core/dev.c:6542
__napi_poll+0xc0/0x430 net/core/dev.c:7101
napi_poll net/core/dev.c:7168 [inline]
net_rx_action+0x4d4/0xa10 net/core/dev.c:7258
handle_softirqs+0x339/0x830 kernel/softirq.c:576
do_softirq+0x142/0x210 kernel/softirq.c:477
__local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:401
rcu_read_unlock_bh include/linux/rcupdate.h:810 [inline]
__dev_queue_xmit+0x1cbf/0x2f80 net/core/dev.c:4341
batadv_send_skb_packet+0x384/0x5f0 net/batman-adv/send.c:108
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x698/0x840 net/batman-adv/bat_iv_ogm.c:1703
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3011 [inline]
call_rcu+0x189/0x950 kernel/rcu/tree.c:3091
br_del_if+0x158/0x3a0 net/bridge/br_if.c:749
do_set_master net/core/rtnetlink.c:2566 [inline]
do_setlink+0xf17/0x3d60 net/core/rtnetlink.c:2791
rtnl_group_changelink net/core/rtnetlink.c:3301 [inline]
__rtnl_newlink net/core/rtnetlink.c:3465 [inline]
rtnl_newlink+0xf8d/0x1a50 net/core/rtnetlink.c:3577
rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5687
netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
__sys_sendmsg net/socket.c:2528 [inline]
__do_sys_sendmsg net/socket.c:2537 [inline]
__se_sys_sendmsg+0x1af/0x290 net/socket.c:2535
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888022b6b800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 424 bytes inside of
1024-byte region [ffff888022b6b800, ffff888022b6bc00)
The buggy address belongs to the page:
page:ffffea00008ada00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22b68
head:ffffea00008ada00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea000084fe00 0000000300000003 ffff888016c41dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4194, ts 55628657995, free_ts 55606522626
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
__alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x80a/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node_track_caller+0x1fc/0x3a0 mm/slub.c:4963
kmalloc_reserve net/core/skbuff.c:356 [inline]
__alloc_skb+0x22c/0x750 net/core/skbuff.c:427
alloc_skb include/linux/skbuff.h:1162 [inline]
nlmsg_new include/net/netlink.h:964 [inline]
rtmsg_fib+0xe7/0x4b0 net/ipv4/fib_semantics.c:520
fib_table_insert+0xd36/0x1bb0 net/ipv4/fib_trie.c:1379
fib_magic+0x2e1/0x3c0 net/ipv4/fib_frontend.c:1106
fib_add_ifaddr+0x3f7/0x5e0 net/ipv4/fib_frontend.c:1150
fib_netdev_event+0x35c/0x480 net/ipv4/fib_frontend.c:1488
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2074 [inline]
call_netdevice_notifiers net/core/dev.c:2088 [inline]
__dev_notify_flags+0x194/0x300 net/core/dev.c:8917
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8955
do_setlink+0xcdb/0x3d60 net/core/rtnetlink.c:2784
__rtnl_newlink net/core/rtnetlink.c:3455 [inline]
rtnl_newlink+0x1658/0x1a50 net/core/rtnetlink.c:3577
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3225 [inline]
kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3261
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_skb_with_frags+0xa7/0x730 net/core/skbuff.c:6170
sock_alloc_send_pskb+0x87f/0x9a0 net/core/sock.c:2536
unix_dgram_sendmsg+0x5fc/0x18a0 net/unix/af_unix.c:1809
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
__sys_sendto+0x46d/0x620 net/socket.c:2072
__do_sys_sendto net/socket.c:2084 [inline]
__se_sys_sendto net/socket.c:2080 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2080
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Memory state around the buggy address:
ffff888022b6b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888022b6b900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888022b6b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888022b6ba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888022b6ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
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If the report is already addressed, let syzbot know by replying with:
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If you want to overwrite report's subsystems, reply with:
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If the report is a duplicate of another one, reply with:
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If you want to undo deduplication, reply with:
#syz undup
syzbot found the following issue on:
HEAD commit: ef251c45f1cd Linux 5.15.204
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1596e696580000
kernel config: https://syzkaller.appspot.com/x/.config?x=353ae28c40b35af5
dashboard link: https://syzkaller.appspot.com/bug?extid=b99962661ed5ca12a4a7
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bde897c3d01f/disk-ef251c45.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/51b2a5826cd1/vmlinux-ef251c45.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cb95a5a40121/bzImage-ef251c45.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b99962...@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: use-after-free in br_multicast_has_router_adjacent+0x3b3/0x490 net/bridge/br_multicast.c:4820
Read of size 8 at addr ffff888022b6b9a8 by task kworker/u4:6/4281
CPU: 0 PID: 4281 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: bat_events batadv_mcast_mla_update
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
br_multicast_has_router_adjacent+0x3b3/0x490 net/bridge/br_multicast.c:4820
batadv_mcast_mla_rtr_flags_bridge_get net/batman-adv/multicast.c:204 [inline]
batadv_mcast_mla_rtr_flags_get net/batman-adv/multicast.c:233 [inline]
batadv_mcast_mla_flags_get net/batman-adv/multicast.c:257 [inline]
__batadv_mcast_mla_update net/batman-adv/multicast.c:876 [inline]
batadv_mcast_mla_update+0x527/0x3150 net/batman-adv/multicast.c:915
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Allocated by task 151:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
__kasan_kmalloc+0xb5/0xf0 mm/kasan/common.c:522
kmalloc_reserve net/core/skbuff.c:356 [inline]
pskb_expand_head+0x127/0x10f0 net/core/skbuff.c:1709
__skb_cow include/linux/skbuff.h:3406 [inline]
skb_cow_head include/linux/skbuff.h:3440 [inline]
batadv_skb_head_push+0x162/0x1f0 net/batman-adv/soft-interface.c:73
batadv_send_skb_packet+0xf7/0x5f0 net/batman-adv/send.c:86
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x698/0x840 net/batman-adv/bat_iv_ogm.c:1703
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Freed by task 151:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x6b8/0x800 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
kfree_skb_reason+0xaf/0x110 net/core/skbuff.c:776
kfree_skb include/linux/skbuff.h:1118 [inline]
__netif_receive_skb_core+0x3116/0x3690 net/core/dev.c:5525
__netif_receive_skb_one_core net/core/dev.c:5549 [inline]
__netif_receive_skb+0x74/0x290 net/core/dev.c:5665
process_backlog+0x370/0x790 net/core/dev.c:6542
__napi_poll+0xc0/0x430 net/core/dev.c:7101
napi_poll net/core/dev.c:7168 [inline]
net_rx_action+0x4d4/0xa10 net/core/dev.c:7258
handle_softirqs+0x339/0x830 kernel/softirq.c:576
do_softirq+0x142/0x210 kernel/softirq.c:477
__local_bh_enable_ip+0x180/0x1c0 kernel/softirq.c:401
rcu_read_unlock_bh include/linux/rcupdate.h:810 [inline]
__dev_queue_xmit+0x1cbf/0x2f80 net/core/dev.c:4341
batadv_send_skb_packet+0x384/0x5f0 net/batman-adv/send.c:108
batadv_iv_ogm_send_to_if net/batman-adv/bat_iv_ogm.c:392 [inline]
batadv_iv_ogm_emit net/batman-adv/bat_iv_ogm.c:420 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x698/0x840 net/batman-adv/bat_iv_ogm.c:1703
process_one_work+0x85f/0x1010 kernel/workqueue.c:2310
worker_thread+0xaa6/0x1290 kernel/workqueue.c:2457
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Last potentially related work creation:
kasan_save_stack+0x35/0x60 mm/kasan/common.c:38
kasan_record_aux_stack+0xb8/0x100 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3011 [inline]
call_rcu+0x189/0x950 kernel/rcu/tree.c:3091
br_del_if+0x158/0x3a0 net/bridge/br_if.c:749
do_set_master net/core/rtnetlink.c:2566 [inline]
do_setlink+0xf17/0x3d60 net/core/rtnetlink.c:2791
rtnl_group_changelink net/core/rtnetlink.c:3301 [inline]
__rtnl_newlink net/core/rtnetlink.c:3465 [inline]
rtnl_newlink+0xf8d/0x1a50 net/core/rtnetlink.c:3577
rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5687
netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445
___sys_sendmsg+0x236/0x2e0 net/socket.c:2499
__sys_sendmsg net/socket.c:2528 [inline]
__do_sys_sendmsg net/socket.c:2537 [inline]
__se_sys_sendmsg+0x1af/0x290 net/socket.c:2535
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
The buggy address belongs to the object at ffff888022b6b800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 424 bytes inside of
1024-byte region [ffff888022b6b800, ffff888022b6bc00)
The buggy address belongs to the page:
page:ffffea00008ada00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22b68
head:ffffea00008ada00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea000084fe00 0000000300000003 ffff888016c41dc0
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4194, ts 55628657995, free_ts 55606522626
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1bbd/0x1ca0 mm/page_alloc.c:4192
__alloc_pages+0x1ee/0x480 mm/page_alloc.c:5501
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x80a/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
__kmalloc_node_track_caller+0x1fc/0x3a0 mm/slub.c:4963
kmalloc_reserve net/core/skbuff.c:356 [inline]
__alloc_skb+0x22c/0x750 net/core/skbuff.c:427
alloc_skb include/linux/skbuff.h:1162 [inline]
nlmsg_new include/net/netlink.h:964 [inline]
rtmsg_fib+0xe7/0x4b0 net/ipv4/fib_semantics.c:520
fib_table_insert+0xd36/0x1bb0 net/ipv4/fib_trie.c:1379
fib_magic+0x2e1/0x3c0 net/ipv4/fib_frontend.c:1106
fib_add_ifaddr+0x3f7/0x5e0 net/ipv4/fib_frontend.c:1150
fib_netdev_event+0x35c/0x480 net/ipv4/fib_frontend.c:1488
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:391
call_netdevice_notifiers_extack net/core/dev.c:2074 [inline]
call_netdevice_notifiers net/core/dev.c:2088 [inline]
__dev_notify_flags+0x194/0x300 net/core/dev.c:8917
dev_change_flags+0xe3/0x1a0 net/core/dev.c:8955
do_setlink+0xcdb/0x3d60 net/core/rtnetlink.c:2784
__rtnl_newlink net/core/rtnetlink.c:3455 [inline]
rtnl_newlink+0x1658/0x1a50 net/core/rtnetlink.c:3577
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1340 [inline]
free_pcp_prepare mm/page_alloc.c:1391 [inline]
free_unref_page_prepare+0x637/0x6c0 mm/page_alloc.c:3317
free_unref_page+0x8f/0x2a0 mm/page_alloc.c:3396
qlist_free_all+0x35/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x150/0x160 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xd0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x4c/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3225 [inline]
kmem_cache_alloc_node+0x12d/0x2d0 mm/slub.c:3261
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_skb_with_frags+0xa7/0x730 net/core/skbuff.c:6170
sock_alloc_send_pskb+0x87f/0x9a0 net/core/sock.c:2536
unix_dgram_sendmsg+0x5fc/0x18a0 net/unix/af_unix.c:1809
sock_sendmsg_nosec net/socket.c:706 [inline]
__sock_sendmsg net/socket.c:718 [inline]
__sys_sendto+0x46d/0x620 net/socket.c:2072
__do_sys_sendto net/socket.c:2084 [inline]
__se_sys_sendto net/socket.c:2080 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2080
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
Memory state around the buggy address:
ffff888022b6b880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888022b6b900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888022b6b980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888022b6ba00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888022b6ba80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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