Hello,
syzbot found the following issue on:
HEAD commit: c16c81c81336 Linux 5.15.178
git tree: linux-5.15.y
console output:
https://syzkaller.appspot.com/x/log.txt?x=111e8864580000
kernel config:
https://syzkaller.appspot.com/x/.config?x=d302c69e93fb6774
dashboard link:
https://syzkaller.appspot.com/bug?extid=f1019d951034409a2869
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/267e46ee7273/disk-c16c81c8.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/944e289206cf/vmlinux-c16c81c8.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/f8cadf62458e/bzImage-c16c81c8.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+f1019d...@syzkaller.appspotmail.com
usb 42-1: device descriptor read/8, error -71
usb 42-1: SetAddress Request (3) to port 0
==================================================================
BUG: KASAN: use-after-free in kobject_put+0x2a0/0x460 lib/kobject.c:757
Read of size 1 at addr ffff8880770b00e4 by task kworker/0:7/5186
CPU: 0 PID: 5186 Comm: kworker/0:7 Not tainted 5.15.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
print_address_description+0x63/0x3b0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0x16b/0x1c0 mm/kasan/report.c:451
kobject_put+0x2a0/0x460 lib/kobject.c:757
vhci_urb_enqueue+0x9bc/0xf30 drivers/usb/usbip/vhci_hcd.c:767
usb_hcd_submit_urb+0x368/0x1de0 drivers/usb/core/hcd.c:1559
usb_start_wait_urb+0x10f/0x510 drivers/usb/core/message.c:58
usb_internal_control_msg drivers/usb/core/message.c:102 [inline]
usb_control_msg+0x2ad/0x4c0 drivers/usb/core/message.c:153
hub_set_address drivers/usb/core/hub.c:4659 [inline]
hub_port_init+0xc1e/0x27d0 drivers/usb/core/hub.c:4971
hub_port_connect drivers/usb/core/hub.c:5386 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5597 [inline]
port_event drivers/usb/core/hub.c:5743 [inline]
hub_event+0x28ed/0x54c0 drivers/usb/core/hub.c:5825
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Allocated by task 5186:
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+0xba/0xf0 mm/kasan/common.c:513
kasan_kmalloc include/linux/kasan.h:264 [inline]
kmem_cache_alloc_trace+0x143/0x290 mm/slub.c:3247
kmalloc include/linux/slab.h:591 [inline]
kzalloc include/linux/slab.h:721 [inline]
usb_alloc_dev+0x5b/0xe50 drivers/usb/core/usb.c:704
hub_port_connect drivers/usb/core/hub.c:5359 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5597 [inline]
port_event drivers/usb/core/hub.c:5743 [inline]
hub_event+0x2290/0x54c0 drivers/usb/core/hub.c:5825
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Freed by task 154:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kfree+0xf1/0x270 mm/slub.c:4559
device_release+0x91/0x1c0
kobject_cleanup lib/kobject.c:713 [inline]
kobject_release lib/kobject.c:744 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x224/0x460 lib/kobject.c:761
vhci_device_reset+0x61/0x150 drivers/usb/usbip/vhci_hcd.c:1081
event_handler+0x2ea/0x4b0 drivers/usb/usbip/usbip_event.c:85
process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310
worker_thread+0xaca/0x1280 kernel/workqueue.c:2457
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
The buggy address belongs to the object at ffff8880770b0000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 228 bytes inside of
2048-byte region [ffff8880770b0000, ffff8880770b0800)
The buggy address belongs to the page:
page:ffffea0001dc2c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x770b0
head:ffffea0001dc2c00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888017442000
raw: 0000000000000000 0000000000080008 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 4174, ts 48510871056, free_ts 48455791193
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x3b78/0x3d40 mm/page_alloc.c:4192
__alloc_pages+0x272/0x700 mm/page_alloc.c:5465
alloc_slab_page mm/slub.c:1775 [inline]
allocate_slab mm/slub.c:1912 [inline]
new_slab+0xbb/0x4b0 mm/slub.c:1975
___slab_alloc+0x6f6/0xe10 mm/slub.c:3008
__slab_alloc mm/slub.c:3095 [inline]
slab_alloc_node mm/slub.c:3186 [inline]
__kmalloc_node_track_caller+0x1f6/0x390 mm/slub.c:4958
kmalloc_reserve net/core/skbuff.c:356 [inline]
pskb_expand_head+0x111/0x1130 net/core/skbuff.c:1709
netlink_trim+0x183/0x220 net/netlink/af_netlink.c:1293
netlink_broadcast_filtered+0x62/0x11a0 net/netlink/af_netlink.c:1498
netlink_broadcast net/netlink/af_netlink.c:1543 [inline]
nlmsg_multicast include/net/netlink.h:1033 [inline]
nlmsg_notify+0xf7/0x1b0 net/netlink/af_netlink.c:2532
rtnl_notify net/core/rtnetlink.c:759 [inline]
rtmsg_ifinfo_send net/core/rtnetlink.c:3905 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:3920 [inline]
rtnetlink_event+0x155/0x1b0 net/core/rtnetlink.c:5698
notifier_call_chain kernel/notifier.c:83 [inline]
raw_notifier_call_chain+0xd0/0x170 kernel/notifier.c:391
call_netdevice_notifiers_info net/core/dev.c:2018 [inline]
call_netdevice_notifiers_extack net/core/dev.c:2030 [inline]
call_netdevice_notifiers net/core/dev.c:2044 [inline]
dev_set_mac_address+0x325/0x470 net/core/dev.c:9082
dev_set_mac_address_user+0x2d/0x50 net/core/dev.c:9096
do_setlink+0x7f0/0x3d80 net/core/rtnetlink.c:2731
__rtnl_newlink net/core/rtnetlink.c:3447 [inline]
rtnl_newlink+0x17d6/0x2070 net/core/rtnetlink.c:3569
rtnetlink_rcv_msg+0x993/0xee0 net/core/rtnetlink.c:5647
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+0xc34/0xcf0 mm/page_alloc.c:3317
free_unref_page+0x95/0x2d0 mm/page_alloc.c:3396
free_slab mm/slub.c:2015 [inline]
discard_slab mm/slub.c:2021 [inline]
__unfreeze_partials+0x1b7/0x210 mm/slub.c:2507
put_cpu_partial+0x132/0x1a0 mm/slub.c:2587
do_slab_free mm/slub.c:3487 [inline]
___cache_free+0xe3/0x100 mm/slub.c:3506
qlist_free_all+0x36/0x90 mm/kasan/quarantine.c:176
kasan_quarantine_reduce+0x162/0x180 mm/kasan/quarantine.c:283
__kasan_slab_alloc+0x2f/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:254 [inline]
slab_post_alloc_hook+0x53/0x380 mm/slab.h:519
slab_alloc_node mm/slub.c:3220 [inline]
kmem_cache_alloc_node+0x121/0x2c0 mm/slub.c:3256
__alloc_skb+0xdd/0x590 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
alloc_skb_with_frags+0xa3/0x780 net/core/skbuff.c:6170
sock_alloc_send_pskb+0x915/0xa50 net/core/sock.c:2533
mld_newpack+0x1b4/0xa20 net/ipv6/mcast.c:1748
add_grhead net/ipv6/mcast.c:1851 [inline]
add_grec+0x1328/0x1770 net/ipv6/mcast.c:1989
mld_send_cr net/ipv6/mcast.c:2115 [inline]
mld_ifc_work+0x68f/0xc90 net/ipv6/mcast.c:2653
Memory state around the buggy address:
ffff8880770aff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880770b0000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880770b0080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880770b0100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880770b0180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
---
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