media: videobuf2: forbid remove_bufs when legacy fileio is active

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commit 27afd6e066 upstream.

vb2_ioctl_remove_bufs() call manipulates queue internal buffer list,
potentially overwriting some pointers used by the legacy fileio access
mode. Forbid that ioctl when fileio is active to protect internal queue
state between subsequent read/write calls.

CC: stable@vger.kernel.org
Fixes: a3293a8538 ("media: v4l2: Add REMOVE_BUFS ioctl")
Reported-by: Shuangpeng Bai <SJB7183@psu.edu>
Closes: https://lore.kernel.org/linux-media/5317B590-AAB4-4F17-8EA1-621965886D49@psu.edu/
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Marek Szyprowski 2025-10-23 16:26:34 +02:00 • committed by Greg Kroah-Hartman

parent d3ecc18281

commit a6a493b985

1 changed files with 5 additions and 0 deletions

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drivers/media/common/videobuf2/videobuf2-v4l2.c

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