linux-kernel - [PATCH 4.19 23/85] net: usb: pegasus: fix improper read if get

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Message-Id: <20190822171732.175012031@linuxfoundation.org>
Date:   Thu, 22 Aug 2019 10:18:56 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+3499a83b2d062ae409d4@...kaller.appspotmail.com,
        Denis Kirjanov <kda@...ux-powerpc.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.19 23/85] net: usb: pegasus: fix improper read if get_registers() fail

From: Denis Kirjanov <kda@...ux-powerpc.org>

commit 224c04973db1125fcebefffd86115f99f50f8277 upstream.

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

Reported-by: syzbot+3499a83b2d062ae409d4@...kaller.appspotmail.com
Signed-off-by: Denis Kirjanov <kda@...ux-powerpc.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/usb/pegasus.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/usb/pegasus.c
+++ b/drivers/net/usb/pegasus.c
@@ -285,7 +285,7 @@ static void mdio_write(struct net_device
 static int read_eprom_word(pegasus_t *pegasus, __u8 index, __u16 *retdata)
 {
 	int i;
-	__u8 tmp;
+	__u8 tmp = 0;
 	__le16 retdatai;
 	int ret;