[PATCH 4.14 058/204] media: usb: Check az6007_read() return value

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From: Daniil Dulov <d.dulov@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 1414d59e85ba7..1830badb180d8 100644
--- a/drivers/media/usb/dvb-usb-v2/az6007.c
+++ b/drivers/media/usb/dvb-usb-v2/az6007.c
@@ -210,7 +210,8 @@ 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






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