media: v4l2-core: only zero-out ioctl-read buffers

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The memset() got moved out of the check for _IOC_NONE, so passing a
made-up command number with a size but no direction would allow clearing
data on user-provided pointers.

Move video_get_user() back into the _IOC_NONE check where it belongs.

Reported-by: syzbot+54fd8cca4b7226c94b8e@syzkaller.appspotmail.com
Fixes: 6c625c01c7a6 ("media: v4l2-core: split out data copy from video_usercopy")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

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Arnd Bergmann 2020-01-08 11:00:00 +01:00 • committed by Mauro Carvalho Chehab

parent e4b9b6454d

commit 1dc8b65c94

1 changed files with 4 additions and 4 deletions

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drivers/media/v4l2-core/v4l2-ioctl.c

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