KASAN: use-after-free Write in skb_queue_tail
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syzbot
Jun 6, 2021, 10:17:20 PM6/6/21
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 1722257b Linux 4.19.193
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=158abfdfd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fd6b8809ec913bf1
dashboard link: https://syzkaller.appspot.com/bug?extid=aa2a09784e3835154996
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aa2a09...@syzkaller.appspotmail.com
Process accounting resumed
==================================================================
BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:288 [inline]
BUG: KASAN: use-after-free in __skb_insert include/linux/skbuff.h:1760 [inline]
BUG: KASAN: use-after-free in __skb_queue_before include/linux/skbuff.h:1869 [inline]
BUG: KASAN: use-after-free in __skb_queue_tail include/linux/skbuff.h:1903 [inline]
BUG: KASAN: use-after-free in skb_queue_tail+0x11a/0x140 net/core/skbuff.c:2940
Write of size 8 at addr ffff888000101080 by task syz-executor.4/5261
CPU: 0 PID: 5261 Comm: syz-executor.4 Not tainted 4.19.193-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
kasan_report mm/kasan/report.c:412 [inline]
__asan_report_store8_noabort+0x88/0x90 mm/kasan/report.c:438
__write_once_size include/linux/compiler.h:288 [inline]
__skb_insert include/linux/skbuff.h:1760 [inline]
__skb_queue_before include/linux/skbuff.h:1869 [inline]
__skb_queue_tail include/linux/skbuff.h:1903 [inline]
skb_queue_tail+0x11a/0x140 net/core/skbuff.c:2940
__netlink_sendskb net/netlink/af_netlink.c:1264 [inline]
netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline]
do_one_broadcast net/netlink/af_netlink.c:1474 [inline]
netlink_broadcast_filtered+0x74b/0xbc0 net/netlink/af_netlink.c:1518
netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542
nlmsg_multicast include/net/netlink.h:591 [inline]
xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline]
xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977
km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023
xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline]
xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455
xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753
xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076
xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline]
xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211
ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124
rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931
inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efd88fae188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 00000000000002e9 RSI: 0000000020000480 RDI: 0000000000000006
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001f4 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd057548df R14: 00007efd88fae300 R15: 0000000000022000
Allocated by task 5261:
kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
skb_clone+0x151/0x3d0 net/core/skbuff.c:1293
__netlink_deliver_tap_skb net/netlink/af_netlink.c:296 [inline]
__netlink_deliver_tap net/netlink/af_netlink.c:321 [inline]
netlink_deliver_tap+0x955/0xb00 net/netlink/af_netlink.c:334
__netlink_sendskb net/netlink/af_netlink.c:1262 [inline]
netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline]
do_one_broadcast net/netlink/af_netlink.c:1474 [inline]
netlink_broadcast_filtered+0x73c/0xbc0 net/netlink/af_netlink.c:1518
netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542
nlmsg_multicast include/net/netlink.h:591 [inline]
xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline]
xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977
km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023
xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline]
xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455
xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753
xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076
xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline]
xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211
ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124
rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931
inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 5261:
__cache_free mm/slab.c:3503 [inline]
kmem_cache_free+0x7f/0x260 mm/slab.c:3765
kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595
__kfree_skb net/core/skbuff.c:655 [inline]
consume_skb+0x120/0x3d0 net/core/skbuff.c:714
nlmon_xmit+0xdb/0x120 drivers/net/nlmon.c:25
__netdev_start_xmit include/linux/netdevice.h:4345 [inline]
netdev_start_xmit include/linux/netdevice.h:4359 [inline]
xmit_one net/core/dev.c:3256 [inline]
dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272
__dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838
__netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline]
__netlink_deliver_tap net/netlink/af_netlink.c:321 [inline]
netlink_deliver_tap+0x8fb/0xb00 net/netlink/af_netlink.c:334
__netlink_sendskb net/netlink/af_netlink.c:1262 [inline]
netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline]
do_one_broadcast net/netlink/af_netlink.c:1474 [inline]
netlink_broadcast_filtered+0x73c/0xbc0 net/netlink/af_netlink.c:1518
netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542
nlmsg_multicast include/net/netlink.h:591 [inline]
xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline]
xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977
km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023
xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline]
xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455
xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753
xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076
xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline]
xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211
ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124
rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931
inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888000101080
which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 0 bytes inside of
232-byte region [ffff888000101080, ffff888000101168)
The buggy address belongs to the page:
page:ffffea0000004040 count:1 mapcount:0 mapping:ffff8880b5b95d80 index:0x0
flags: 0x7ff00000000100(slab)
raw: 007ff00000000100 ffffea0002bcb448 ffffea0002a11a08 ffff8880b5b95d80
raw: 0000000000000000 ffff888000101080 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888000100f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888000101000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888000101080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888000101100: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
ffff888000101180: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
---
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.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 1722257b Linux 4.19.193
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=158abfdfd00000
kernel config: https://syzkaller.appspot.com/x/.config?x=fd6b8809ec913bf1
dashboard link: https://syzkaller.appspot.com/bug?extid=aa2a09784e3835154996
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+aa2a09...@syzkaller.appspotmail.com
Process accounting resumed
==================================================================
BUG: KASAN: use-after-free in __write_once_size include/linux/compiler.h:288 [inline]
BUG: KASAN: use-after-free in __skb_insert include/linux/skbuff.h:1760 [inline]
BUG: KASAN: use-after-free in __skb_queue_before include/linux/skbuff.h:1869 [inline]
BUG: KASAN: use-after-free in __skb_queue_tail include/linux/skbuff.h:1903 [inline]
BUG: KASAN: use-after-free in skb_queue_tail+0x11a/0x140 net/core/skbuff.c:2940
Write of size 8 at addr ffff888000101080 by task syz-executor.4/5261
CPU: 0 PID: 5261 Comm: syz-executor.4 Not tainted 4.19.193-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
kasan_report mm/kasan/report.c:412 [inline]
__asan_report_store8_noabort+0x88/0x90 mm/kasan/report.c:438
__write_once_size include/linux/compiler.h:288 [inline]
__skb_insert include/linux/skbuff.h:1760 [inline]
__skb_queue_before include/linux/skbuff.h:1869 [inline]
__skb_queue_tail include/linux/skbuff.h:1903 [inline]
skb_queue_tail+0x11a/0x140 net/core/skbuff.c:2940
__netlink_sendskb net/netlink/af_netlink.c:1264 [inline]
netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline]
do_one_broadcast net/netlink/af_netlink.c:1474 [inline]
netlink_broadcast_filtered+0x74b/0xbc0 net/netlink/af_netlink.c:1518
netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542
nlmsg_multicast include/net/netlink.h:591 [inline]
xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline]
xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977
km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023
xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline]
xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455
xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753
xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076
xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline]
xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211
ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124
rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931
inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efd88fae188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 00000000000002e9 RSI: 0000000020000480 RDI: 0000000000000006
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001f4 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffd057548df R14: 00007efd88fae300 R15: 0000000000022000
Allocated by task 5261:
kmem_cache_alloc+0x122/0x370 mm/slab.c:3559
skb_clone+0x151/0x3d0 net/core/skbuff.c:1293
__netlink_deliver_tap_skb net/netlink/af_netlink.c:296 [inline]
__netlink_deliver_tap net/netlink/af_netlink.c:321 [inline]
netlink_deliver_tap+0x955/0xb00 net/netlink/af_netlink.c:334
__netlink_sendskb net/netlink/af_netlink.c:1262 [inline]
netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline]
do_one_broadcast net/netlink/af_netlink.c:1474 [inline]
netlink_broadcast_filtered+0x73c/0xbc0 net/netlink/af_netlink.c:1518
netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542
nlmsg_multicast include/net/netlink.h:591 [inline]
xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline]
xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977
km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023
xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline]
xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455
xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753
xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076
xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline]
xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211
ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124
rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931
inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
Freed by task 5261:
__cache_free mm/slab.c:3503 [inline]
kmem_cache_free+0x7f/0x260 mm/slab.c:3765
kfree_skbmem+0xc1/0x140 net/core/skbuff.c:595
__kfree_skb net/core/skbuff.c:655 [inline]
consume_skb+0x120/0x3d0 net/core/skbuff.c:714
nlmon_xmit+0xdb/0x120 drivers/net/nlmon.c:25
__netdev_start_xmit include/linux/netdevice.h:4345 [inline]
netdev_start_xmit include/linux/netdevice.h:4359 [inline]
xmit_one net/core/dev.c:3256 [inline]
dev_hard_start_xmit+0x1a8/0x920 net/core/dev.c:3272
__dev_queue_xmit+0x269d/0x2e00 net/core/dev.c:3838
__netlink_deliver_tap_skb net/netlink/af_netlink.c:303 [inline]
__netlink_deliver_tap net/netlink/af_netlink.c:321 [inline]
netlink_deliver_tap+0x8fb/0xb00 net/netlink/af_netlink.c:334
__netlink_sendskb net/netlink/af_netlink.c:1262 [inline]
netlink_broadcast_deliver net/netlink/af_netlink.c:1389 [inline]
do_one_broadcast net/netlink/af_netlink.c:1474 [inline]
netlink_broadcast_filtered+0x73c/0xbc0 net/netlink/af_netlink.c:1518
netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1542
nlmsg_multicast include/net/netlink.h:591 [inline]
xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1091 [inline]
xfrm_send_acquire+0x81b/0xac0 net/xfrm/xfrm_user.c:2977
km_query+0xc5/0x210 net/xfrm/xfrm_state.c:2023
xfrm_state_find+0x1d21/0x2d90 net/xfrm/xfrm_state.c:1042
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:1410 [inline]
xfrm_tmpl_resolve+0x2f3/0xc20 net/xfrm/xfrm_policy.c:1455
xfrm_resolve_and_create_bundle+0xd8/0x3e0 net/xfrm/xfrm_policy.c:1753
xfrm_lookup_with_ifid+0x232/0x1c40 net/xfrm/xfrm_policy.c:2076
xfrm_lookup net/xfrm/xfrm_policy.c:2200 [inline]
xfrm_lookup_route+0x36/0x1e0 net/xfrm/xfrm_policy.c:2211
ip6_dst_lookup_flow+0x159/0x1d0 net/ipv6/ip6_output.c:1124
rawv6_sendmsg+0xc65/0x36a0 net/ipv6/raw.c:931
inet_sendmsg+0x132/0x5a0 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
___sys_sendmsg+0x3b3/0x8e0 net/socket.c:2115
__sys_sendmmsg+0x195/0x470 net/socket.c:2210
__do_sys_sendmmsg net/socket.c:2239 [inline]
__se_sys_sendmmsg net/socket.c:2236 [inline]
__x64_sys_sendmmsg+0x99/0x100 net/socket.c:2236
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
The buggy address belongs to the object at ffff888000101080
which belongs to the cache skbuff_head_cache of size 232
The buggy address is located 0 bytes inside of
232-byte region [ffff888000101080, ffff888000101168)
The buggy address belongs to the page:
page:ffffea0000004040 count:1 mapcount:0 mapping:ffff8880b5b95d80 index:0x0
flags: 0x7ff00000000100(slab)
raw: 007ff00000000100 ffffea0002bcb448 ffffea0002a11a08 ffff8880b5b95d80
raw: 0000000000000000 ffff888000101080 000000010000000c 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888000100f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888000101000: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888000101080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888000101100: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
ffff888000101180: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot
Oct 4, 2021, 10:17:15 PM10/4/21
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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