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| author | Shuangpeng Bai <shuangpeng.kernel@gmail.com> | 2026-07-06 16:24:06 -0400 |
|---|---|---|
| committer | Hans Verkuil <hverkuil+cisco@kernel.org> | 2026-07-15 17:12:55 +0200 |
| commit | fc530fe168bb2b745a93f553ad21fc25fd9cba3d (patch) | |
| tree | 373f3ff5710bf615b1bc6dfc5a05e50465ca9f1e /tools/perf/scripts/python | |
| parent | 76e379754ba618989f6215be608d5c04774a611d (diff) | |
media: usbtv: keep device alive while ALSA card exists
The ALSA PCM callbacks store the driver state in pcm->private_data. An
open PCM file can outlive USB disconnect because usbtv_audio_free() uses
snd_card_free_when_closed(). The disconnect path can then drop the V4L2
device reference and free struct usbtv before ALSA releases the substream,
so a later close dereferences freed memory in snd_usbtv_pcm_close().
Take a V4L2 device reference for the ALSA card and drop it from the card
private_free callback. This keeps struct usbtv valid until ALSA has closed
the remaining files and freed the card.
Closes: https://lore.kernel.org/r/178144969601.60470.4852887710381872458@gmail.com
Fixes: 63ddf68de52e ("[media] usbtv: add audio support")
Cc: stable@vger.kernel.org
Signed-off-by: Shuangpeng Bai <shuangpeng.kernel@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions