syzbot


KFENCE: invalid free in __hci_req_sync

Status: upstream: reported on 2024/05/13 08:05
Reported-by: syzbot+fc354d92b934fe7548f1@syzkaller.appspotmail.com
First crash: 42d, last: 42d
Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KFENCE: invalid free in __hci_req_sync bluetooth 25 13h45m 51d 0/27 upstream: reported on 2024/05/04 01:00

Sample crash report:
==================================================================
BUG: KFENCE: invalid free in kfree_skb include/linux/skbuff.h:1220 [inline]
BUG: KFENCE: invalid free in __hci_req_sync+0x626/0x940 net/bluetooth/hci_request.c:184

Invalid free of 0xffff88823bdac000 (in kfence-#213):
 kfree_skb include/linux/skbuff.h:1220 [inline]
 __hci_req_sync+0x626/0x940 net/bluetooth/hci_request.c:184
 hci_req_sync+0xa5/0xc0 net/bluetooth/hci_request.c:206
 hci_dev_cmd+0x2fc/0xa30 net/bluetooth/hci_core.c:790
 sock_do_ioctl+0x152/0x450 net/socket.c:1204
 sock_ioctl+0x47f/0x770 net/socket.c:1321
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

kfence-#213: 0xffff88823bdac000-0xffff88823bdac0ef, size=240, cache=skbuff_head_cache

allocated by task 3570 on cpu 1 at 339.858362s:
 skb_clone+0x1e5/0x360 net/core/skbuff.c:1660
 hci_send_cmd_sync net/bluetooth/hci_core.c:4179 [inline]
 hci_cmd_work+0x296/0x660 net/bluetooth/hci_core.c:4199
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

freed by task 3570 on cpu 1 at 339.861251s:
 kfree_skb include/linux/skbuff.h:1220 [inline]
 hci_req_sync_complete+0xee/0x280 net/bluetooth/hci_request.c:109
 hci_event_packet+0xc49/0x1510 net/bluetooth/hci_event.c:7601
 hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4130
 process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
 worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
 kthread+0x28d/0x320 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

CPU: 0 PID: 8892 Comm: syz-executor.0 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
==================================================================

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/13 08:04 linux-6.1.y 909ba1f1b414 9026e142 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan KFENCE: invalid free in __hci_req_sync
* Struck through repros no longer work on HEAD.