diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-06-26 04:15:07 -0700 |
|---|---|---|
| committer | Kamal Mostafa <kamal@canonical.com> | 2013-07-30 11:31:21 -0700 |
| commit | 2d48a667c5195a0b7ac50655231f487077224a78 (patch) | |
| tree | 2815d9d82ce6432e35b8f6708870f0e773f2a8b7 | |
| parent | 42f1fb6b210fb488df6fc3308883cde1588d40e3 (diff) | |
ipv6: ip6_sk_dst_check() must not assume ipv6 dst
[ Upstream commit a963a37d384d71ad43b3e9e79d68d42fbe0901f3 ]
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: Dave Jones <davej@redhat.com>
Reported-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
| -rw-r--r-- | net/ipv6/ip6_output.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 2adff320db8a..978e4a3c96a3 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -843,11 +843,17 @@ static struct dst_entry *ip6_sk_dst_check(struct sock *sk, const struct flowi6 *fl6) { struct ipv6_pinfo *np = inet6_sk(sk); - struct rt6_info *rt = (struct rt6_info *)dst; + struct rt6_info *rt; if (!dst) 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 * case is not very simple. Take into account, * that we do not support routing by source, TOS, |