[BUG] KASAN: slab-use-after-free in go7007_snd_hw_free

[Shuangpeng Bai]

Hi Kernel Maintainers,

I hit the following report while testing current upstream kernel:

KASAN: slab-use-after-free in go7007_snd_hw_free

on commit: e8c2f9fdadee7cbc75134dc463c1e0d856d6e5c7 (May 25 2026)

The reproducer and .config files are here.
https://gist.github.com/shuangpengbai/88fca2a40cdcef309541cf4e9f6c1d5b

I'm happy to test debug patches or provide additional information.

Reported-by: Shuangpeng Bai <shuangpeng.kernel@xxxxxxxxx>

[  136.245938][ T8273] BUG: KASAN: slab-use-after-free in go7007_snd_hw_free (drivers/media/usb/go7007/snd-go7007.c:111)
[  136.247442][ T8273] Write of size 8 at addr ffff888108745090 by task repro_go7007_al/8273
[  136.248893][ T8273]
[  136.249399][ T8273] Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[  136.249421][ T8273] Call Trace:
[  136.249439][ T8273]  <TASK>
[  136.249444][ T8273]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  136.249571][ T8273]  print_report (mm/kasan/report.c:378 mm/kasan/report.c:482)
[  136.249689][ T8273]  kasan_report (mm/kasan/report.c:595)
[  136.249704][ T8273]  go7007_snd_hw_free (drivers/media/usb/go7007/snd-go7007.c:111)
[  136.249711][ T8273]  snd_pcm_release_substream (sound/core/pcm_native.c:933 sound/core/pcm_native.c:2776)
[  136.249773][ T8273]  snd_pcm_release (sound/core/pcm_native.c:2965)
[  136.249782][ T8273]  __fput (fs/file_table.c:510)
[  136.249806][ T8273]  fput_close_sync (fs/file_table.c:615)
[  136.249889][ T8273]  __x64_sys_close (fs/open.c:1507 fs/open.c:1492 fs/open.c:1492)
[  136.249912][ T8273]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[  136.249930][ T8273]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[  136.249974][ T8273] RIP: 0033:0x7ff69a1cfc03
[  136.249990][ T8273] Code: e9 37 ff ff ff e8 2d f9 01 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 45 c3 0f 1f 40 00 48 83 ec 18 89 7c 24 0c e8
[  136.249997][ T8273] RSP: 002b:00007ffefc060c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
[  136.250036][ T8273] RAX: ffffffffffffffda RBX: 0000000000000009 RCX: 00007ff69a1cfc03
[  136.250042][ T8273] RDX: 24abb4819636a0c4 RSI: 0000000000000000 RDI: 000000000000000b
[  136.250046][ T8273] RBP: 0000000000000001 R08: 0000000000000009 R09: 0000000000000000
[  136.250049][ T8273] R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000001
[  136.250053][ T8273] R13: 000055e2002d7e60 R14: 00007ffefc060ce0 R15: 0000000000000000
[  136.250085][ T8273]  </TASK>
[  136.250088][ T8273]
[  136.264706][ T8273] Freed by task 776 on cpu 1 at 135.227504s:
[  136.265113][ T8273]  kasan_save_track (mm/kasan/common.c:57 mm/kasan/common.c:78)
[  136.265447][ T8273]  kasan_save_free_info (mm/kasan/generic.c:584)
[  136.265801][ T8273]  __kasan_slab_free (mm/kasan/common.c:253 mm/kasan/common.c:285)
[  136.266132][ T8273]  kfree (include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6251 mm/slub.c:6566)
[  136.266414][ T8273]  v4l2_device_put (drivers/media/v4l2-core/v4l2-device.c:51 include/linux/kref.h:65 drivers/media/v4l2-core/v4l2-device.c:56)
[  136.266753][ T8273]  usb_unbind_interface (drivers/usb/core/driver.c:458)
[  136.267128][ T8273]  device_release_driver_internal (drivers/base/dd.c:621 drivers/base/dd.c:1352 drivers/base/dd.c:1375)
[  136.267579][ T8273]  bus_remove_device (drivers/base/bus.c:657)
[  136.267918][ T8273]  device_del (drivers/base/core.c:3895)
[  136.268214][ T8273]  usb_disable_device (drivers/usb/core/message.c:1478)
[  136.268577][ T8273]  usb_disconnect (drivers/input/misc/yealink.c:421)
[  136.268904][ T8273]  hub_event (drivers/usb/core/hub.c:5407 drivers/usb/core/hub.c:5707 drivers/usb/core/hub.c:5871 drivers/usb/core/hub.c:5953)
[  136.269209][ T8273]  process_scheduled_works (kernel/workqueue.c:3314 kernel/workqueue.c:3397)
[  136.269599][ T8273]  worker_thread (kernel/workqueue.c:3478)
[  136.269968][ T8273]  kthread (kernel/kthread.c:436)
[  136.270335][ T8273]  ret_from_fork (kernel/process.c:158)
[  136.270667][ T8273]  ret_from_fork_asm (arch/x86/entry/entry_64.S:245)
[  136.270993][ T8273]
[  136.271155][ T8273] The buggy address belongs to the object at ffff888108744000
[  136.271155][ T8273]  which belongs to the cache kmalloc-8k of size 8192
[  136.272231][ T8273] The buggy address is located 4240 bytes inside of
[  136.272231][ T8273]  freed 8192-byte region [ffff888108744000, ffff888108746000)
[  136.273166][ T8273]


Best,
Shuangpeng