linux-kernel - [PATCH 6.8 439/715] media: go7007: add check of return value of go7007_read

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Date: Sun, 24 Mar 2024 18:30:18 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Daniil Dulov <d.dulov@...ddin.ru>,
	Hans Verkuil <hverkuil-cisco@...all.nl>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.8 439/715] media: go7007: add check of return value of go7007_read_addr()

From: Daniil Dulov <d.dulov@...ddin.ru>

[ Upstream commit 0b70530ee740861f4776ff724fcc25023df1799a ]

If go7007_read_addr() returns error channel is not assigned a value.
In this case go to allocfail.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 866b8695d67e ("Staging: add the go7007 video driver")
Signed-off-by: Daniil Dulov <d.dulov@...ddin.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/usb/go7007/go7007-usb.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/go7007/go7007-usb.c b/drivers/media/usb/go7007/go7007-usb.c
index eeb85981e02b6..762c13e49bfa5 100644
--- a/drivers/media/usb/go7007/go7007-usb.c
+++ b/drivers/media/usb/go7007/go7007-usb.c
@@ -1201,7 +1201,9 @@ static int go7007_usb_probe(struct usb_interface *intf,
 				u16 channel;
 
 				/* read channel number from GPIO[1:0] */
-				go7007_read_addr(go, 0x3c81, &channel);
+				if (go7007_read_addr(go, 0x3c81, &channel))
+					goto allocfail;
+
 				channel &= 0x3;
 				go->board_id = GO7007_BOARDID_ADLINK_MPG24;
 				usb->board = board = &board_adlink_mpg24;
-- 
2.43.0