From: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
[ Upstream commit d9ba9934285514f1f95d96326a82398a22dc77f2 ]
Paul Holzinger reported [0] that commit 5456262d2baa ("net: Fix
incorrect address comparison when searching for a bind2 bucket")
introduced a bind() regression. Paul also gave a nice repro that
calls two types of bind() on the same port, both of which now
succeed, but the second call should fail:
bind(fd1, ::, port) + bind(fd2, 127.0.0.1, port)
The cited commit added address family tests in three functions to
fix the uninit-value KMSAN report. [1] However, the test added to
inet_bind2_bucket_match_addr_any() removed a necessary conflict
check; the dual-stack wildcard address no longer conflicts with
an IPv4 non-wildcard address.
If tb->family is AF_INET6 and sk->sk_family is AF_INET in
inet_bind2_bucket_match_addr_any(), we still need to check
if tb has the dual-stack wildcard address.
Note that the IPv4 wildcard address does not conflict with
IPv6 non-wildcard addresses.
[0]: https://lore.kernel.org/netdev/e21bf153-80b0-9ec0-15ba-e04a4ad42c34@xxxxxxxxxx/
[1]: https://lore.kernel.org/netdev/CAG_fn=Ud3zSW7AZWXc+asfMhZVL5ETnvuY44Pmyv4NPv-ijN-A@xxxxxxxxxxxxxx/
Fixes: 5456262d2baa ("net: Fix incorrect address comparison when searching for a bind2 bucket")
Signed-off-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Reported-by: Paul Holzinger <pholzing@xxxxxxxxxx>
Link: https://lore.kernel.org/netdev/CAG_fn=Ud3zSW7AZWXc+asfMhZVL5ETnvuY44Pmyv4NPv-ijN-A@xxxxxxxxxxxxxx/
Reviewed-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Tested-by: Paul Holzinger <pholzing@xxxxxxxxxx>
Reviewed-by: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/ipv4/inet_hashtables.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index 7a13dd7f546b6..7b05315264b0c 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -828,8 +828,14 @@ bool inet_bind2_bucket_match_addr_any(const struct inet_bind2_bucket *tb, const
#if IS_ENABLED(CONFIG_IPV6)
struct in6_addr addr_any = {};
- if (sk->sk_family != tb->family)
+ if (sk->sk_family != tb->family) {
+ if (sk->sk_family == AF_INET)
+ return net_eq(ib2_net(tb), net) && tb->port == port &&
+ tb->l3mdev == l3mdev &&
+ ipv6_addr_equal(&tb->v6_rcv_saddr, &addr_any);
+
return false;
+ }
if (sk->sk_family == AF_INET6)
return net_eq(ib2_net(tb), net) && tb->port == port &&
--
2.39.2
