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media: uvcvideo: Avoid invalid memory access

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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>
This commit is contained in:
Ricardo Ribalda 2021-12-01 06:22:17 +01:00 committed by Mauro Carvalho Chehab
parent c8ed7d2f61
commit f0577b1b63
1 changed files with 1 additions and 1 deletions
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2
drivers/media/usb/uvc/uvc_ctrl.c
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@ -1638,7 +1638,7 @@ static int uvc_ctrl_find_ctrl_idx(struct uvc_entity *entity,
struct v4l2_ext_controls *ctrls,
struct uvc_control *uvc_control)
{
struct uvc_control_mapping *mapping;
struct uvc_control_mapping *mapping = NULL;
struct uvc_control *ctrl_found;
unsigned int i;