4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mathias Krause <mini...@googlemail.com>
[ Upstream commit 309cf37fe2a781279b7675d4bb7173198e532867 ]
Because we miss to wipe the remainder of i->addr[] in packet_mc_add(),
pdiag_put_mclist() leaks uninitialized heap bytes via the
PACKET_DIAG_MCLIST netlink attribute.
Fix this by explicitly memset(0)ing the remaining bytes in i->addr[].
Fixes: eea68e2f1a00 ("packet: Report socket mclist info via diag module")
Signed-off-by: Mathias Krause <mini...@googlemail.com>
Cc: Eric W. Biederman <ebied...@xmission.com>
Cc: Pavel Emelyanov <xe...@parallels.com>
Acked-by: Pavel Emelyanov <xe...@virtuozzo.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
net/packet/af_packet.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -3436,6 +3436,7 @@ static int packet_mc_add(struct sock *sk
i->ifindex = mreq->mr_ifindex;
i->alen = mreq->mr_alen;
memcpy(i->addr, mreq->mr_address, i->alen);
+ memset(i->addr + i->alen, 0, sizeof(i->addr) - i->alen);
i->count = 1;
i->next = po->mclist;
po->mclist = i;
