netdev - [PATCH] net: qrtr: potential use after free in qrtr

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Message-ID: <20170420102130.jhafz7e532y5iqd4@mwanda>
Date:   Thu, 20 Apr 2017 13:21:30 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Courtney Cavin <courtney.cavin@...ymobile.com>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        David Ahern <dsa@...ulusnetworks.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Johannes Berg <johannes.berg@...el.com>,
        netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH] net: qrtr: potential use after free in qrtr_sendmsg()

If skb_pad() fails then it frees the skb so we should check for errors.

Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index c36b0ec364a4..a9a8c7d5a4a9 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -658,7 +658,9 @@ static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 	}
 
 	if (plen != len) {
-		skb_pad(skb, plen - len);
+		rc = skb_pad(skb, plen - len);
+		if (rc)
+			goto out_node;
 		skb_put(skb, plen - len);
 	}