提交 a963a37d 编写于 作者: E Eric Dumazet 提交者: David S. Miller

ipv6: ip6_sk_dst_check() must not assume ipv6 dst

It's possible to use AF_INET6 sockets and to connect to an IPv4
destination. After this, socket dst cache is a pointer to a rtable,
not rt6_info.

ip6_sk_dst_check() should check the socket dst cache is IPv6, or else
various corruptions/crashes can happen.

Dave Jones can reproduce immediate crash with
trinity -q -l off -n -c sendmsg -c connect

With help from Hannes Frederic Sowa
Reported-by: NDave Jones <davej@redhat.com>
Reported-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: NEric Dumazet <edumazet@google.com>
Acked-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 5dbe7c17
...@@ -821,11 +821,17 @@ static struct dst_entry *ip6_sk_dst_check(struct sock *sk, ...@@ -821,11 +821,17 @@ static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
const struct flowi6 *fl6) const struct flowi6 *fl6)
{ {
struct ipv6_pinfo *np = inet6_sk(sk); struct ipv6_pinfo *np = inet6_sk(sk);
struct rt6_info *rt = (struct rt6_info *)dst; struct rt6_info *rt;
if (!dst) if (!dst)
goto out; goto out;
if (dst->ops->family != AF_INET6) {
dst_release(dst);
return NULL;
}
rt = (struct rt6_info *)dst;
/* Yes, checking route validity in not connected /* Yes, checking route validity in not connected
* case is not very simple. Take into account, * case is not very simple. Take into account,
* that we do not support routing by source, TOS, * that we do not support routing by source, TOS,
......
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