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. Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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4861292f73
Коммит
cf970c002d
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@ -870,11 +870,13 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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if (family == AF_INET) {
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struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
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sin->sin_family = AF_INET;
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sin->sin_port = 0 /* skb->h.uh->source */;
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sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
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memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
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*addr_len = sizeof(*sin);
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if (sin) {
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sin->sin_family = AF_INET;
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sin->sin_port = 0 /* skb->h.uh->source */;
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sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
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memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
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*addr_len = sizeof(*sin);
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}
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if (isk->cmsg_flags)
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ip_cmsg_recv(msg, skb);
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@ -886,16 +888,18 @@ int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
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struct sockaddr_in6 *sin6 =
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(struct sockaddr_in6 *)msg->msg_name;
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = 0;
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sin6->sin6_addr = ip6->saddr;
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sin6->sin6_flowinfo = 0;
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if (np->sndflow)
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sin6->sin6_flowinfo = ip6_flowinfo(ip6);
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sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
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IP6CB(skb)->iif);
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*addr_len = sizeof(*sin6);
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if (sin6) {
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sin6->sin6_family = AF_INET6;
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sin6->sin6_port = 0;
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sin6->sin6_addr = ip6->saddr;
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sin6->sin6_flowinfo = 0;
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if (np->sndflow)
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sin6->sin6_flowinfo = ip6_flowinfo(ip6);
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sin6->sin6_scope_id =
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ipv6_iface_scope_id(&sin6->sin6_addr,
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IP6CB(skb)->iif);
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*addr_len = sizeof(*sin6);
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}
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if (inet6_sk(sk)->rxopt.all)
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pingv6_ops.ip6_datagram_recv_ctl(sk, msg, skb);
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