syzbot

 sign-in | mailing list | source | docs
🐞 Open [78]
🐞 Fixed [22]
🐞 Invalid [342]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
💬 Send us feedback

KASAN: use-after-free Write in steam_input_open

Status: upstream: reported C repro on 2025/02/24 11:20
Reported-by: syzbot+7ef0477c08c2091b13fa@syzkaller.appspotmail.com
First crash: 83d, last: 11d
▶ ▼ Similar bugs (6)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-15 KASAN: use-after-free Write in steam_input_open origin:lts C 46 4d03h 252d 0/2 upstream: reported C repro on 2024/09/08 02:35
android-6-1 KASAN: use-after-free Write in steam_input_open origin:lts C 44 12d 235d 0/2 upstream: reported C repro on 2024/09/25 04:26
android-5-10 KASAN: use-after-free Write in steam_input_open C inconclusive 28 2d13h 257d 0/2 upstream: reported C repro on 2024/09/03 09:12
linux-6.1 KASAN: use-after-free Read in steam_input_open origin:lts-only C done 5 56d 73d 0/3 upstream: reported C repro on 2025/03/06 15:18
upstream KASAN: slab-use-after-free Read in steam_input_open input usb C done 5 71d 85d 27/28 upstream: reported C repro on 2025/02/22 17:01
linux-5.15 KASAN: use-after-free Read in steam_input_open origin:lts-only C error 12 42d 73d 0/3 upstream: reported C repro on 2025/03/06 06:53
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2025/05/04 07:41 7m retest repro android12-5.4 report log
2025/05/04 07:41 16m retest repro android12-5.4 report log
2025/05/04 07:41 8m retest repro android12-5.4 report log
2025/05/04 07:41 15m retest repro android12-5.4 report log
2025/05/04 07:41 5m retest repro android12-5.4 report log
2025/04/05 22:25 1h04m retest repro android12-5.4 report log
2025/04/05 22:25 14m retest repro android12-5.4 report log
2025/04/05 22:25 14m retest repro android12-5.4 report log
2025/04/05 22:25 9m retest repro android12-5.4 report log
2025/04/05 22:25 8m retest repro android12-5.4 report log

Sample crash report:
==================================================================
BUG: KASAN: use-after-free in atomic64_try_cmpxchg include/asm-generic/atomic-instrumented.h:1503 [inline]
BUG: KASAN: use-after-free in atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:442 [inline]
BUG: KASAN: use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:173 [inline]
BUG: KASAN: use-after-free in mutex_lock+0x7f/0xe0 kernel/locking/mutex.c:295
Write of size 8 at addr ffff8881d9973040 by task udevd/364

CPU: 1 PID: 364 Comm: udevd Not tainted 5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 __dump_stack+0x1e/0x20 lib/dump_stack.c:77
 dump_stack+0x15b/0x1b8 lib/dump_stack.c:118
 print_address_description+0x8d/0x4c0 mm/kasan/report.c:384
 __kasan_report+0xef/0x120 mm/kasan/report.c:516
 kasan_report+0x30/0x60 mm/kasan/common.c:653
 check_memory_region_inline mm/kasan/generic.c:141 [inline]
 check_memory_region+0x274/0x280 mm/kasan/generic.c:191
 __kasan_check_write+0x14/0x20 mm/kasan/common.c:99
 atomic64_try_cmpxchg include/asm-generic/atomic-instrumented.h:1503 [inline]
 atomic_long_try_cmpxchg_acquire include/asm-generic/atomic-long.h:442 [inline]
 __mutex_trylock_fast kernel/locking/mutex.c:173 [inline]
 mutex_lock+0x7f/0xe0 kernel/locking/mutex.c:295
 steam_input_open+0x91/0x160 drivers/hid/hid-steam.c:297
 input_open_device+0x14c/0x2a0 drivers/input/input.c:635
 evdev_open_device drivers/input/evdev.c:400 [inline]
 evdev_open+0x494/0x590 drivers/input/evdev.c:486
 chrdev_open+0x597/0x670 fs/char_dev.c:414
 do_dentry_open+0x8b5/0x1030 fs/open.c:806
 vfs_open+0x73/0x80 fs/open.c:920
 do_last fs/namei.c:3565 [inline]
 path_openat+0x2a5e/0x35c0 fs/namei.c:3683
 do_filp_open+0x1ae/0x3f0 fs/namei.c:3713
 do_sys_open+0x2bb/0x5d0 fs/open.c:1123
 __do_sys_openat fs/open.c:1150 [inline]
 __se_sys_openat fs/open.c:1144 [inline]
 __x64_sys_openat+0xa2/0xb0 fs/open.c:1144
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7fb5fce1d9a4
Code: 24 20 48 8d 44 24 30 48 89 44 24 28 64 8b 04 25 18 00 00 00 85 c0 75 2c 44 89 e2 48 89 ee bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 76 60 48 8b 15 55 a4 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007fff9a0300c0 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb5fce1d9a4
RDX: 0000000000080000 RSI: 00005622ba220610 RDI: 00000000ffffff9c
RBP: 00005622ba220610 R08: 00005622ba21cc68 R09: 00007fb5fcef8b10
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000080000
R13: 00007fff9a030288 R14: 0000000000000000 R15: 000056227ebaded5

Allocated by task 125:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 __kasan_kmalloc+0x162/0x200 mm/kasan/common.c:529
 kasan_slab_alloc+0x12/0x20 mm/kasan/common.c:537
 slab_post_alloc_hook mm/slab.h:584 [inline]
 slab_alloc_node mm/slub.c:2829 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 __kmalloc_track_caller+0x10d/0x2d0 mm/slub.c:4449
 alloc_dr drivers/base/devres.c:103 [inline]
 devm_kmalloc+0x36/0x1e0 drivers/base/devres.c:816
 devm_kzalloc include/linux/device.h:953 [inline]
 steam_probe+0x126/0xb00 drivers/hid/hid-steam.c:741
 hid_device_probe+0x287/0x380 drivers/hid/hid-core.c:2296
 really_probe+0x507/0xd20 drivers/base/dd.c:567
 driver_probe_device+0xe7/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x27f/0x3f0 drivers/base/dd.c:864
 bus_for_each_drv+0x175/0x200 drivers/base/bus.c:432
 __device_attach+0x290/0x370 drivers/base/dd.c:933
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:982
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:492
 device_add+0x91c/0xc90 drivers/base/core.c:2911
 hid_add_device+0x356/0x4b0 drivers/hid/hid-core.c:2448
 usbhid_probe+0xb2e/0xee0 drivers/hid/usbhid/hid-core.c:1418
 usb_probe_interface+0x5ff/0xae0 drivers/usb/core/driver.c:361
 really_probe+0x55b/0xd20 drivers/base/dd.c:571
 driver_probe_device+0xe7/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x27f/0x3f0 drivers/base/dd.c:864
 bus_for_each_drv+0x175/0x200 drivers/base/bus.c:432
 __device_attach+0x290/0x370 drivers/base/dd.c:933
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:982
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:492
 device_add+0x91c/0xc90 drivers/base/core.c:2911
 usb_set_configuration+0x19d5/0x1f30 drivers/usb/core/message.c:2029
 generic_probe+0x91/0x150 drivers/usb/core/generic.c:210
 usb_probe_device+0xc1/0x100 drivers/usb/core/driver.c:266
 really_probe+0x55b/0xd20 drivers/base/dd.c:571
 driver_probe_device+0xe7/0x190 drivers/base/dd.c:752
 __device_attach_driver+0x27f/0x3f0 drivers/base/dd.c:864
 bus_for_each_drv+0x175/0x200 drivers/base/bus.c:432
 __device_attach+0x290/0x370 drivers/base/dd.c:933
 device_initial_probe+0x1a/0x20 drivers/base/dd.c:982
 bus_probe_device+0xc0/0x1e0 drivers/base/bus.c:492
 device_add+0x91c/0xc90 drivers/base/core.c:2911
 usb_new_device+0xcd1/0x1450 drivers/usb/core/hub.c:2592
 hub_port_connect drivers/usb/core/hub.c:5225 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5344 [inline]
 port_event drivers/usb/core/hub.c:5490 [inline]
 hub_event+0x26e9/0x4780 drivers/usb/core/hub.c:5572
 process_one_work+0x73b/0xcc0 kernel/workqueue.c:2290
 worker_thread+0xa5c/0x13b0 kernel/workqueue.c:2436
 kthread+0x31e/0x3a0 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354

Freed by task 125:
 save_stack mm/kasan/common.c:70 [inline]
 set_track mm/kasan/common.c:78 [inline]
 kasan_set_free_info mm/kasan/common.c:345 [inline]
 __kasan_slab_free+0x1c3/0x280 mm/kasan/common.c:487
 kasan_slab_free+0xe/0x10 mm/kasan/common.c:496
 slab_free_hook mm/slub.c:1455 [inline]
 slab_free_freelist_hook+0xb7/0x180 mm/slub.c:1494
 slab_free mm/slub.c:3080 [inline]
 kfree+0xbe/0x260 mm/slub.c:4071
 release_nodes+0x716/0x790 drivers/base/devres.c:508
 devres_release_all+0x7c/0xa0 drivers/base/devres.c:529
 __device_release_driver drivers/base/dd.c:1191 [inline]
 device_release_driver_internal+0x4d3/0x710 drivers/base/dd.c:1220
 device_release_driver+0x19/0x20 drivers/base/dd.c:1243
 bus_remove_device+0x2dd/0x340 drivers/base/bus.c:534
 device_del+0x660/0xfb0 drivers/base/core.c:3088
 hid_remove_device drivers/hid/hid-core.c:2496 [inline]
 hid_destroy_device+0x6a/0x110 drivers/hid/hid-core.c:2515
 usbhid_disconnect+0x9f/0xc0 drivers/hid/usbhid/hid-core.c:1445
 usb_unbind_interface+0x212/0x8c0 drivers/usb/core/driver.c:423
 __device_release_driver drivers/base/dd.c:1188 [inline]
 device_release_driver_internal+0x4c4/0x710 drivers/base/dd.c:1220
 device_release_driver+0x19/0x20 drivers/base/dd.c:1243
 bus_remove_device+0x2dd/0x340 drivers/base/bus.c:534
 device_del+0x660/0xfb0 drivers/base/core.c:3088
 usb_disable_device+0x3a8/0x750 drivers/usb/core/message.c:1277
 usb_disconnect+0x31e/0x850 drivers/usb/core/hub.c:2248
 hub_port_connect drivers/usb/core/hub.c:5068 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5344 [inline]
 port_event drivers/usb/core/hub.c:5490 [inline]
 hub_event+0x18e9/0x4780 drivers/usb/core/hub.c:5572
 process_one_work+0x73b/0xcc0 kernel/workqueue.c:2290
 process_scheduled_works kernel/workqueue.c:2352 [inline]
 worker_thread+0xd82/0x13b0 kernel/workqueue.c:2438
 kthread+0x31e/0x3a0 kernel/kthread.c:288
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:354

The buggy address belongs to the object at ffff8881d9973000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 64 bytes inside of
 512-byte region [ffff8881d9973000, ffff8881d9973200)
The buggy address belongs to the page:
page:ffffea0007665c00 refcount:1 mapcount:0 mapping:ffff8881f5c02500 index:0x0 compound_mapcount: 0
flags: 0x8000000000010200(slab|head)
raw: 8000000000010200 dead000000000100 dead000000000122 ffff8881f5c02500
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL)
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook mm/page_alloc.c:2165 [inline]
 prep_new_page+0x35e/0x370 mm/page_alloc.c:2171
 get_page_from_freelist+0x1296/0x1310 mm/page_alloc.c:3794
 __alloc_pages_nodemask+0x202/0x4b0 mm/page_alloc.c:4894
 alloc_slab_page+0x3c/0x3b0 mm/slub.c:343
 allocate_slab mm/slub.c:1683 [inline]
 new_slab+0x93/0x420 mm/slub.c:1749
 new_slab_objects mm/slub.c:2505 [inline]
 ___slab_alloc+0x29e/0x420 mm/slub.c:2667
 __slab_alloc+0x63/0xa0 mm/slub.c:2707
 slab_alloc_node mm/slub.c:2792 [inline]
 slab_alloc mm/slub.c:2837 [inline]
 kmem_cache_alloc_trace+0x130/0x290 mm/slub.c:2854
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:690 [inline]
 cpuacct_css_alloc+0x54/0x130 kernel/sched/cpuacct.c:66
 css_create kernel/cgroup/cgroup.c:5353 [inline]
 cgroup_apply_control_enable+0x325/0x13c0 kernel/cgroup/cgroup.c:3232
 cgroup_mkdir+0xeba/0x1700 kernel/cgroup/cgroup.c:5598
 kernfs_iop_mkdir+0x234/0x370 fs/kernfs/dir.c:1142
 vfs_mkdir+0x4c7/0x6a0 fs/namei.c:3965
 do_mkdirat+0x14c/0x340 fs/namei.c:3987
 __do_sys_mkdir fs/namei.c:4003 [inline]
 __se_sys_mkdir fs/namei.c:4001 [inline]
 __x64_sys_mkdir+0x60/0x70 fs/namei.c:4001
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8881d9972f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881d9972f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881d9973000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                           ^
 ffff8881d9973080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881d9973100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
hid 0003:28DE:1102.0003: No HID_FEATURE_REPORT submitted -  nothing to read
hid 0003:28DE:1102.0003: No HID_FEATURE_REPORT submitted -  nothing to read
hid 0003:28DE:1102.0003: No HID_FEATURE_REPORT submitted -  nothing to read
hid 0003:28DE:1102.0003: No HID_FEATURE_REPORT submitted -  nothing to read
hid 0003:28DE:1102.0003: No HID_FEATURE_REPORT submitted -  nothing to read

Crashes (29):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/05/06 22:59 android12-5.4 cd8e74fa0fa3 350f4ffc .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/15 11:29 android12-5.4 6b07fcd94a6a e2826670 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/15 11:11 android12-5.4 6b07fcd94a6a e2826670 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/15 10:22 android12-5.4 6b07fcd94a6a e2826670 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/12 13:09 android12-5.4 6b07fcd94a6a ee70e6db .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/11 10:41 android12-5.4 6b07fcd94a6a 16256247 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/11 00:17 android12-5.4 6b07fcd94a6a 16256247 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/10 23:45 android12-5.4 6b07fcd94a6a 16256247 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/10 22:16 android12-5.4 6b07fcd94a6a 16256247 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 23:09 android12-5.4 6b07fcd94a6a 7e3bd60d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 22:43 android12-5.4 6b07fcd94a6a 7e3bd60d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 17:27 android12-5.4 6b07fcd94a6a 7e3bd60d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 17:04 android12-5.4 6b07fcd94a6a 7e3bd60d .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/02/24 11:18 android12-5.4 6b07fcd94a6a d34966d1 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/22 14:37 android12-5.4 41adfeb3d639 c6512ef7 .config console log report syz / log [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/04/20 03:51 android12-5.4 41adfeb3d639 2a20f901 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/12 00:47 android12-5.4 6b07fcd94a6a ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/12 00:47 android12-5.4 6b07fcd94a6a ee70e6db .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/11 06:10 android12-5.4 6b07fcd94a6a 16256247 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/09 18:28 android12-5.4 6b07fcd94a6a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/09 18:24 android12-5.4 6b07fcd94a6a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/09 12:13 android12-5.4 6b07fcd94a6a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/09 01:42 android12-5.4 6b07fcd94a6a 163f510d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/08 11:18 android12-5.4 6b07fcd94a6a 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 22:21 android12-5.4 6b07fcd94a6a 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 22:19 android12-5.4 6b07fcd94a6a 7e3bd60d .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 06:19 android12-5.4 6b07fcd94a6a 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/07 05:01 android12-5.4 6b07fcd94a6a 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
2025/03/06 07:12 android12-5.4 6b07fcd94a6a 831e3629 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan KASAN: use-after-free Write in steam_input_open
* Struck through repros no longer work on HEAD.