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| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2013-11-18 07:07:45 +0100 |
|---|---|---|
| committer | Ziyan <jaraidaniel@gmail.com> | 2016-03-11 15:57:03 +0100 |
| commit | 0ea36994dec559df6f63dcae75b9b360b53560b6 (patch) | |
| tree | ed844e6571e4be5969758243edd1059e16a3eb46 /net/ipv4 | |
| parent | 2ac38dd9eb30e8a466e6b615326f2a180753d80f (diff) | |
| download | kernel_samsung_espresso10-0ea36994dec559df6f63dcae75b9b360b53560b6.zip kernel_samsung_espresso10-0ea36994dec559df6f63dcae75b9b360b53560b6.tar.gz kernel_samsung_espresso10-0ea36994dec559df6f63dcae75b9b360b53560b6.tar.bz2 | |
ping: prevent NULL pointer dereference on write to msg_name
A plain read() on a socket does set msg->msg_name to NULL. So check for
NULL pointer first.
[Backport of net-next cf970c002d270c36202bd5b9c2804d3097a52da0]
Bug: 12780426
Change-Id: I29d9cb95ef05ec76d37517e01317f4a29e60931c
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ping.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c index e8e680e..353a44b 100644 --- a/net/ipv4/ping.c +++ b/net/ipv4/ping.c @@ -884,10 +884,12 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, /* Copy the address and add cmsg data. */ if (family == AF_INET) { sin = (struct sockaddr_in *) msg->msg_name; - sin->sin_family = AF_INET; - sin->sin_port = 0 /* skb->h.uh->source */; - sin->sin_addr.s_addr = ip_hdr(skb)->saddr; - memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + if (sin) { + sin->sin_family = AF_INET; + sin->sin_port = 0 /* skb->h.uh->source */; + sin->sin_addr.s_addr = ip_hdr(skb)->saddr; + memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); + } if (isk->cmsg_flags) ip_cmsg_recv(msg, skb); @@ -897,17 +899,19 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, struct ipv6_pinfo *np = inet6_sk(sk); struct ipv6hdr *ip6 = ipv6_hdr(skb); sin6 = (struct sockaddr_in6 *) msg->msg_name; - sin6->sin6_family = AF_INET6; - sin6->sin6_port = 0; - sin6->sin6_addr = ip6->saddr; - - sin6->sin6_flowinfo = 0; - if (np->sndflow) - sin6->sin6_flowinfo = - *(__be32 *)ip6 & IPV6_FLOWINFO_MASK; - sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, - IP6CB(skb)->iif); + if (sin6) { + sin6->sin6_family = AF_INET6; + sin6->sin6_port = 0; + sin6->sin6_addr = ip6->saddr; + sin6->sin6_flowinfo = 0; + if (np->sndflow) + sin6->sin6_flowinfo = + *(__be32 *)ip6 & IPV6_FLOWINFO_MASK; + sin6->sin6_scope_id = + ipv6_iface_scope_id(&sin6->sin6_addr, + IP6CB(skb)->iif); + } if (inet6_sk(sk)->rxopt.all) pingv6_ops.datagram_recv_ctl(sk, msg, skb); |