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| author | Mathias Krause <minipli@googlemail.com> | 2016-04-10 12:52:28 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-05-18 17:06:35 -0700 |
| commit | a416c9483c719cc9160b4b9af09085dfe461383f (patch) | |
| tree | f9e25b187e96079297f7884095c8584cd39e194e | |
| parent | d0bfda58b414487f06ac0911674a9808f71d3ab1 (diff) | |
| download | lwn-a416c9483c719cc9160b4b9af09085dfe461383f.tar.gz lwn-a416c9483c719cc9160b4b9af09085dfe461383f.zip | |
packet: fix heap info leak in PACKET_DIAG_MCLIST sock_diag interface
[ 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 <minipli@googlemail.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/packet/af_packet.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index da1ae0e13cb5..9cc7b512b472 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -3436,6 +3436,7 @@ 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; |