On 08/26/2015 05:03 PM, Xin Long wrote:
> in sctp_process_asconf(), we get address parameter from the beginning of
> the addip params. but we never check if it's really there. if the addr
> param is not there, it still can pass sctp_verify_asconf(), then to be
> handled by sctp_process_asconf(), it will not be safe.
> 
> so add detection in sctp_verify_asconf() to check the address parameter is in
> the beginning, or return false to send abort.
> 
> Signed-off-by: Xin Long <lucien....@gmail.com>
> Signed-off-by: Vlad Yasevich <vyase...@redhat.com>

Acked-by: Vlad Yasevich <vyasev...@gmail.com>

-vlad

> ---
>  net/sctp/sm_make_chunk.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
> index 06320c8..f3fc881 100644
> --- a/net/sctp/sm_make_chunk.c
> +++ b/net/sctp/sm_make_chunk.c
> @@ -3132,12 +3132,14 @@ bool sctp_verify_asconf(const struct sctp_association 
> *asoc,
>               case SCTP_PARAM_IPV4_ADDRESS:
>                       if (length != sizeof(sctp_ipv4addr_param_t))
>                               return false;
> -                     addr_param_seen = true;
> +                     if (param.v == addip->addip_hdr.params)
> +                             addr_param_seen = true;
>                       break;
>               case SCTP_PARAM_IPV6_ADDRESS:
>                       if (length != sizeof(sctp_ipv6addr_param_t))
>                               return false;
> -                     addr_param_seen = true;
> +                     if (param.v == addip->addip_hdr.params)
> +                             addr_param_seen = true;
>                       break;
>               case SCTP_PARAM_ADD_IP:
>               case SCTP_PARAM_DEL_IP:
> 

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html

Reply via email to