KASAN: null-ptr-deref Write in rhashtable_free_and_destroy

Status: fixed on 2021/03/10 01:49
Subsystems: wireless
[Documentation on labels]
Fix commit: 905b2032fa42 mac80211: mesh: fix mesh_pathtbl_init() error path
First crash: 2065d, last: 1988d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KASAN: null-ptr-deref Write in rhashtable_free_and_destroy (2) wireless 12 syz, C unreliable 38 1669d 1934d 20/29 fixed on 2022/03/08 16:11
linux-4.19 BUG: unable to handle kernel NULL pointer dereference in rhashtable_free_and_destroy 10 syz, C error 31 1519d 2108d 0/1 upstream: reported C repro on 2020/10/21 05:32

Sample crash report:
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
BUG: KASAN: null-ptr-deref in test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
BUG: KASAN: null-ptr-deref in try_to_grab_pending.part.0+0x26/0x720 kernel/workqueue.c:1257
Write of size 8 at addr 0000000000000088 by task kworker/0:5/9838

CPU: 0 PID: 9838 Comm: kworker/0:5 Not tainted 5.11.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events cfg80211_destroy_iface_wk
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 __kasan_report mm/kasan/report.c:400 [inline]
 kasan_report.cold+0x5f/0xd5 mm/kasan/report.c:413
 check_memory_region_inline mm/kasan/generic.c:179 [inline]
 check_memory_region+0x13d/0x180 mm/kasan/generic.c:185
 instrument_atomic_read_write include/linux/instrumented.h:101 [inline]
 test_and_set_bit include/asm-generic/bitops/instrumented-atomic.h:70 [inline]
 try_to_grab_pending.part.0+0x26/0x720 kernel/workqueue.c:1257
 try_to_grab_pending+0xa1/0xd0 kernel/workqueue.c:1310
 __cancel_work_timer+0xa6/0x520 kernel/workqueue.c:3098
 rhashtable_free_and_destroy+0x2b/0x920 lib/rhashtable.c:1137
 mesh_table_free net/mac80211/mesh_pathtbl.c:70 [inline]
 mesh_pathtbl_unregister+0x42/0xa0 net/mac80211/mesh_pathtbl.c:812
 ieee80211_teardown_sdata+0x216/0x2d0 net/mac80211/iface.c:686
 rollback_registered_many+0xc38/0x14c0 net/core/dev.c:9513
 rollback_registered net/core/dev.c:9541 [inline]
 unregister_netdevice_queue+0x2dd/0x570 net/core/dev.c:10717
 unregister_netdevice include/linux/netdevice.h:2868 [inline]
 ieee80211_if_remove+0x213/0x310 net/mac80211/iface.c:2005
 ieee80211_del_iface+0x12/0x20 net/mac80211/cfg.c:144
 rdev_del_virtual_intf net/wireless/rdev-ops.h:57 [inline]
 cfg80211_destroy_ifaces+0x1d9/0x6e0 net/wireless/core.c:334
 cfg80211_destroy_iface_wk+0x1a/0x20 net/wireless/core.c:346
 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x3b1/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
==================================================================

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2021/02/18 14:41 upstream f40ddce88593 14052202 .config console log report info ci-upstream-kasan-gce-root KASAN: null-ptr-deref Write in rhashtable_free_and_destroy
2021/02/06 11:18 upstream 1e0d27fce010 23a562df .config console log report info ci-upstream-kasan-gce-smack-root KASAN: null-ptr-deref Write in rhashtable_free_and_destroy
2021/02/06 01:35 upstream dd86e7fa07a3 23a562df .config console log report info ci-upstream-kasan-gce-smack-root KASAN: null-ptr-deref Write in rhashtable_free_and_destroy
2021/01/09 04:32 upstream 6279d812eab6 c104d4a3 .config console log report info ci-upstream-kasan-gce-root
2021/01/04 12:58 upstream e71ba9452f0b 79264ae3 .config console log report info ci-upstream-kasan-gce-root
2020/12/29 07:43 upstream dea8dcf2a9fa 8259d56c .config console log report info ci-upstream-kasan-gce
2020/12/25 07:37 upstream 3913d00ac51a c2c1d1dd .config console log report info ci-upstream-kasan-gce
2020/12/13 19:10 upstream 6bff9bb8a292 bca53db9 .config console log report info ci-upstream-kasan-gce-selinux-root
2020/12/03 14:38 upstream 34816d20f173 e6b0d314 .config console log report info ci-upstream-kasan-gce-smack-root
2021/01/05 03:55 upstream 36bbbd0e234d 2a28ff1f .config console log report info ci-upstream-kasan-gce-386
2021/01/09 07:28 net-old 6279d812eab6 c104d4a3 .config console log report info ci-upstream-net-this-kasan-gce
* Struck through repros no longer work on HEAD.