From: James Chapman <jchapman@katalix.com>
Date: Thu, 24 Jul 2008 06:52:47 +0000 (-0700)
Subject: l2tp: Fix potential memory corruption in pppol2tp_recvmsg()
X-Git-Tag: v2.6.25.13~6
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0c9b216d1ce5c322631c21bd6656ec35047ffc87;p=karo-tx-linux.git

l2tp: Fix potential memory corruption in pppol2tp_recvmsg()

[ Upstream commit 6b6707a50c7598a83820077393f8823ab791abf8 ]

This patch fixes a potential memory corruption in
pppol2tp_recvmsg(). If skb->len is bigger than the caller's buffer
length, memcpy_toiovec() will go into unintialized data on the kernel
heap, interpret it as an iovec and start modifying memory.

The fix is to change the memcpy_toiovec() call to
skb_copy_datagram_iovec() so that paged packets (rare for PPPOL2TP)
are handled properly. Also check that the caller's buffer is big
enough for the data and set the MSG_TRUNC flag if it is not so.

Reported-by: Ilja <ilja@netric.org>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

diff --git a/drivers/net/pppol2tp.c b/drivers/net/pppol2tp.c
index a629355ffccf..a3e1d227ce35 100644
--- a/drivers/net/pppol2tp.c
+++ b/drivers/net/pppol2tp.c
@@ -783,14 +783,18 @@ static int pppol2tp_recvmsg(struct kiocb *iocb, struct socket *sock,
 	err = 0;
 	skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
 				flags & MSG_DONTWAIT, &err);
-	if (skb) {
-		err = memcpy_toiovec(msg->msg_iov, (unsigned char *) skb->data,
-				     skb->len);
-		if (err < 0)
-			goto do_skb_free;
-		err = skb->len;
-	}
-do_skb_free:
+	if (!skb)
+		goto end;
+
+	if (len > skb->len)
+		len = skb->len;
+	else if (len < skb->len)
+		msg->msg_flags |= MSG_TRUNC;
+
+	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len);
+	if (likely(err == 0))
+		err = len;
+
 	kfree_skb(skb);
 end:
 	return err;