linux-kernel - [ 052/120] netrom: copy_datagram

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Message-Id: <20121011005835.095441035@linuxfoundation.org>
Date:	Thu, 11 Oct 2012 10:00:04 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Alan Cox <alan@...ux.intel.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 052/120] netrom: copy_datagram_iovec can fail

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------


From: Alan Cox <alan@...ux.intel.com>

[ Upstream commit 6cf5c951175abcec4da470c50565cc0afe6cd11d ]

Check for an error from this and if so bail properly.

Signed-off-by: Alan Cox <alan@...ux.intel.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/netrom/af_netrom.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/net/netrom/af_netrom.c
+++ b/net/netrom/af_netrom.c
@@ -1169,7 +1169,12 @@ static int nr_recvmsg(struct kiocb *iocb
 		msg->msg_flags |= MSG_TRUNC;
 	}
 
-	skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+	er = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+	if (er < 0) {
+		skb_free_datagram(sk, skb);
+		release_sock(sk);
+		return er;
+	}
 
 	if (sax != NULL) {
 		sax->sax25_family = AF_NETROM;


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