[PATCH 6.4 565/800] media: usb: Check az6007_read() return value

Greg Kroah-Hartman
2023-07-16T20:20:36Z

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

[ Upstream commit fdaca63186f59fc664b346c45b76576624b48e57 ]

If az6007_read() returns error, there is no sence to continue.

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

Fixes: 3af2f4f15a61 ("[media] az6007: Change the az6007 read/write routine parameter")
Signed-off-by: Daniil Dulov <d.dulov@aladdin.ru>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/usb/dvb-usb-v2/az6007.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb-v2/az6007.c b/drivers/media/usb/dvb-usb-v2/az6007.c
index 62ee09f28a0bc..7524c90f5da61 100644
--- a/drivers/media/usb/dvb-usb-v2/az6007.c
+++ b/drivers/media/usb/dvb-usb-v2/az6007.c
@@ -202,7 +202,8 @@ static int az6007_rc_query(struct dvb_usb_device *d)
unsigned code;
enum rc_proto proto;

- az6007_read(d, AZ6007_READ_IR, 0, 0, st->data, 10);
+ if (az6007_read(d, AZ6007_READ_IR, 0, 0, st->data, 10) < 0)
+ return -EIO;

if (st->data[1] == 0x44)
return 0;
--
2.39.2