Commit 13b89711 authored by Mathias Krause's avatar Mathias Krause Committed by Willy Tarreau

packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface

commit 309cf37f upstream.

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: eea68e2f ("packet: Report socket mclist info via diag module")
Signed-off-by: default avatarMathias Krause <minipli@googlemail.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Acked-by: default avatarPavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarWilly Tarreau <w@1wt.eu>
parent 3b848d3d
......@@ -2997,6 +2997,7 @@ static int packet_mc_add(struct sock *sk, struct packet_mreq_max *mreq)
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;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment