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

Ben Hutchings
2016-06-12T21:34:42Z

From: Kangjie Lu <kangjielu@gmail.com>

commit b8670c09f37bdf2847cc44f36511a53afc6161fd upstream.

The stack object “info” has a total size of 12 bytes. Its last byte
is padding which is not initialized and leaked via “put_cmsg”.

Signed-off-by: Kangjie Lu <kjlu@gatech.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
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);