In the Linux kernel, the following vulnerability has been resolved:

ASoC: dapm: Fix UAF for snd_soc_pcm_runtime object

When using kernel with the following extra config,

  - CONFIG_KASAN=y
  - CONFIG_KASAN_GENERIC=y
  - CONFIG_KASAN_INLINE=y
  - CONFIG_KASAN_VMALLOC=y
  - CONFIG_FRAME_WARN=4096

kernel detects that snd_pcm_suspend_all() access a freed
'snd_soc_pcm_runtime' object when the system is suspended, which
leads to a use-after-free bug:

[   52.047746] BUG: KASAN: use-after-free in snd_pcm_suspend_all+0x1a8/0x270
[   52.047765] Read of size 1 at addr ffff0000b9434d50 by task systemd-sleep/2330

[   52.047785] Call trace:
[   52.047787]  dump_backtrace+0x0/0x3c0
[   52.047794]  show_stack+0x34/0x50
[   52.047797]  dump_stack_lvl+0x68/0x8c
[   52.047802]  print_address_description.constprop.0+0x74/0x2c0
[   52.047809]  kasan_report+0x210/0x230
[   52.047815]  __asan_report_load1_noabort+0x3c/0x50
[   52.047820]  snd_pcm_suspend_all+0x1a8/0x270
[   52.047824]  snd_soc_suspend+0x19c/0x4e0

The snd_pcm_sync_stop() has a NULL check on 'substream->runtime' before
making any access. So we need to always set 'substream->runtime' to NULL
everytime we kfree() it.

kernel.org https://git.kernel.org/stable/c/3033ed903b4f28b5e1ab66042084fbc2c48f8624 [No types assigned]

kernel.org https://git.kernel.org/stable/c/5d13afd021eb43868fe03cef6da34ad08831ad6d [No types assigned]

kernel.org https://git.kernel.org/stable/c/6a14fad8be178df6c4589667efec1789a3307b4e [No types assigned]

kernel.org https://git.kernel.org/stable/c/8ca21e7a27c66b95a4b215edc8e45e5d66679f9f [No types assigned]

kernel.org https://git.kernel.org/stable/c/993b60c7f93fa1d8ff296b58f646a867e945ae89 [No types assigned]

kernel.org https://git.kernel.org/stable/c/b4a90b543d9f62d3ac34ec1ab97fc5334b048565 [No types assigned]

kernel.org https://git.kernel.org/stable/c/fe5046ca91d631ec432eee3bdb1f1c49b09c8b5e [No types assigned]