From: Denis Kirjanov <kda@linux-powerpc.org>
Date: Tue, 30 Jul 2019 13:13:57 +0000 (+0200)
Subject: net: usb: pegasus: fix improper read if get_registers() fail
X-Git-Tag: v5.4.17~2954^2~31
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=224c04973db1125fcebefffd86115f99f50f8277;p=arm%2Flinux.git

net: usb: pegasus: fix improper read if get_registers() fail

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

Reported-by: syzbot+3499a83b2d062ae409d4@syzkaller.appspotmail.com
Signed-off-by: Denis Kirjanov <kda@linux-powerpc.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/usb/pegasus.c b/drivers/net/usb/pegasus.c
index 6d25dea5ad4b..f7d117d80cfb 100644
--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -282,7 +282,7 @@ 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;