diff options
author | Willem de Bruijn <willemb@google.com> | 2018-12-22 16:53:45 -0500 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-01-13 10:05:28 +0100 |
commit | 33a083483c24fddc2ece3c2d322a6fc39ae9f8b6 (patch) | |
tree | 15a8b391a2b93869968e1ae9422658c2cd6e73b2 /net/packet | |
parent | 5b4dc608f82a7f2504619b3889334e0b621d84b5 (diff) |
packet: validate address length if non-zero
[ Upstream commit 6b8d95f1795c42161dc0984b6863e95d6acf24ed ]
Validate packet socket address length if a length is given. Zero
length is equivalent to not setting an address.
Fixes: 99137b7888f4 ("packet: validate address length")
Reported-by: Ido Schimmel <idosch@idosch.org>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/packet')
-rw-r--r-- | net/packet/af_packet.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index 050dcb71e54e..0f50977ed53b 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -2511,7 +2511,7 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) sll_addr))) goto out; proto = saddr->sll_protocol; - addr = saddr->sll_addr; + addr = saddr->sll_halen ? saddr->sll_addr : NULL; dev = dev_get_by_index(sock_net(&po->sk), saddr->sll_ifindex); if (addr && dev && saddr->sll_halen < dev->addr_len) goto out; @@ -2680,7 +2680,7 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) if (msg->msg_namelen < (saddr->sll_halen + offsetof(struct sockaddr_ll, sll_addr))) goto out; proto = saddr->sll_protocol; - addr = saddr->sll_addr; + addr = saddr->sll_halen ? saddr->sll_addr : NULL; dev = dev_get_by_index(sock_net(sk), saddr->sll_ifindex); if (addr && dev && saddr->sll_halen < dev->addr_len) goto out; |