media: uvcvideo: Avoid invalid memory access

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commit f0577b1b63 upstream.

If mappings points to an invalid memory, we will be invalid accessing
it. Solve it by initializing the value of the variable mapping and by
changing the order in the conditional statement (to avoid accessing
mapping->id if not needed).

Fix:
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN NOPTI

Fixes: 6350d6a4ed ("media: uvcvideo: Set error_idx during ctrl_commit errors")
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Ricardo Ribalda 2021-12-01 06:22:17 +01:00 • committed by Greg Kroah-Hartman

parent 4e15cf870d

commit 69b06b05ff

1 changed files with 1 additions and 1 deletions

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drivers/media/usb/uvc/uvc_ctrl.c

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