[net] inet: Fix missing return value in inet6_hash

From: Craig Gallek <kraig@google.com>

As part of a series to implement faster SO_REUSEPORT lookups,
commit 086c653f5862 ("sock: struct proto hash function may error")
added return values to protocol hash functions and
commit 496611d7b5ea ("inet: create IPv6-equivalent inet_hash function")
implemented a new hash function for IPv6.  However, the latter does
not respect the former's convention.

This properly propagates the hash errors in the IPv6 case.

Fixes: 496611d7b5ea ("inet: create IPv6-equivalent inet_hash function")
Reported-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Craig Gallek <kraig@google.com>
---
 net/ipv6/inet6_hashtables.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

On Tue, Oct 25, 2016 at 6:08 PM, Craig Gallek <kraigatgoog@gmail.com> wrote:
> From: Craig Gallek <kraig@google.com>
>
> As part of a series to implement faster SO_REUSEPORT lookups,
> commit 086c653f5862 ("sock: struct proto hash function may error")
> added return values to protocol hash functions and
> commit 496611d7b5ea ("inet: create IPv6-equivalent inet_hash function")
> implemented a new hash function for IPv6.  However, the latter does
> not respect the former's convention.
>
> This properly propagates the hash errors in the IPv6 case.
>
> Fixes: 496611d7b5ea ("inet: create IPv6-equivalent inet_hash function")
> Reported-by: Soheil Hassas Yeganeh <soheil@google.com>
> Signed-off-by: Craig Gallek <kraig@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>

> ---
>  net/ipv6/inet6_hashtables.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
> index 2fd0374a35b1..02761c9fe43e 100644
> --- a/net/ipv6/inet6_hashtables.c
> +++ b/net/ipv6/inet6_hashtables.c
> @@ -264,13 +264,15 @@ EXPORT_SYMBOL_GPL(inet6_hash_connect);
>
>  int inet6_hash(struct sock *sk)
>  {
> +       int err = 0;
> +
>         if (sk->sk_state != TCP_CLOSE) {
>                 local_bh_disable();
> -               __inet_hash(sk, NULL, ipv6_rcv_saddr_equal);
> +               err = __inet_hash(sk, NULL, ipv6_rcv_saddr_equal);
>                 local_bh_enable();
>         }
>
> -       return 0;
> +       return err;
>  }
>  EXPORT_SYMBOL_GPL(inet6_hash);

Thanks for the fix!

> --
> 2.8.0.rc3.226.g39d4020
>

From: Craig Gallek <kraigatgoog@gmail.com>
Date: Tue, 25 Oct 2016 18:08:49 -0400

> From: Craig Gallek <kraig@google.com>
> 
> As part of a series to implement faster SO_REUSEPORT lookups,
> commit 086c653f5862 ("sock: struct proto hash function may error")
> added return values to protocol hash functions and
> commit 496611d7b5ea ("inet: create IPv6-equivalent inet_hash function")
> implemented a new hash function for IPv6.  However, the latter does
> not respect the former's convention.
> 
> This properly propagates the hash errors in the IPv6 case.
> 
> Fixes: 496611d7b5ea ("inet: create IPv6-equivalent inet_hash function")
> Reported-by: Soheil Hassas Yeganeh <soheil@google.com>
> Signed-off-by: Craig Gallek <kraig@google.com>

Applied and queued up for -stable, thank you.