[PATCH AUTOSEL 4.4 15/28] net: usb: pegasus: fix improper read if get_registers() fail

From: Sasha Levin
Date: Tue Aug 13 2019 - 22:27:43 EST


From: Denis Kirjanov <kda@xxxxxxxxxxxxxxxxx>

[ Upstream commit 224c04973db1125fcebefffd86115f99f50f8277 ]

get_registers() may fail with -ENOMEM and in this
case we can read a garbage from the status variable tmp.

Reported-by: syzbot+3499a83b2d062ae409d4@xxxxxxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Denis Kirjanov <kda@xxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/net/usb/pegasus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index 17fac0121e563..4f505eb4f422c 100644
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -285,7 +285,7 @@ static void mdio_write(struct net_device *dev, int phy_id, int loc, int val)
static int read_eprom_word(pegasus_t *pegasus, __u8 index, __u16 *retdata)
{
int i;
- __u8 tmp;
+ __u8 tmp = 0;
__le16 retdatai;
int ret;

--
2.20.1