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[5.16,0245/1039] media: uvcvideo: Avoid invalid memory access

Message ID 20220124184133.563200222@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Jan. 24, 2022, 6:33 p.m. UTC 
From: Ricardo Ribalda <ribalda@chromium.org>

[ Upstream commit f0577b1b6394f954903fcc67e12fe9e7001dafd6 ]

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: 6350d6a4ed487 ("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: Sasha Levin <sashal@kernel.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index 30bfe9069a1fb..9a25d60292558 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -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;