[PATCH 3.2 44/46] net: fix infoleak in llc

[Ben Hutchings]

3.2.81-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Kangjie Lu <kangjielu@xxxxxxxxx>

commit b8670c09f37bdf2847cc44f36511a53afc6161fd upstream.

The stack object âinfoâ has a total size of 12 bytes. Its last byte
is padding which is not initialized and leaked via âput_cmsgâ.

Signed-off-by: Kangjie Lu <kjlu@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 net/llc/af_llc.c | 1 +
 1 file changed, 1 insertion(+)

--- a/net/llc/af_llc.c
+++ b/net/llc/af_llc.c
@@ -627,6 +627,7 @@ static void llc_cmsg_rcv(struct msghdr *
 	if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
 		struct llc_pktinfo info;
 
+		memset(&info, 0, sizeof(info));
 		info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
 		llc_pdu_decode_dsap(skb, &info.lpi_sap);
 		llc_pdu_decode_da(skb, info.lpi_mac);