[dpdk-dev] [PATCH] examples/ipsec-secgw: fix ip version check

[Sergio Gonzalez Monroy]

On 13/10/2017 13:50, Tomasz Duszynski wrote:
> Since new_ip and ip4 are overlapping buffers copying ip4 over new_ip
> using memmove() might overwrite memory at ip4. This could happen if
> following condition holds:
>
> ip_hdr_len > sizeof(struct esp_hdr) + sa->iv_len
>
> Thus using ip4 to check ip version is wrong as it might not contain
> proper value.
>
> Fixes: f159e70b0922 ("examples/ipsec-secgw: support transport mode")
> Cc: stable at dpdk.org
>
> Signed-off-by: Tomasz Duszynski <tdu at semihalf.com>
> ---
>   examples/ipsec-secgw/esp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/examples/ipsec-secgw/esp.c b/examples/ipsec-secgw/esp.c
> index 2897840..063e63f 100644
> --- a/examples/ipsec-secgw/esp.c
> +++ b/examples/ipsec-secgw/esp.c
> @@ -307,8 +307,8 @@ esp_outbound(struct rte_mbuf *m, struct ipsec_sa *sa,
>   				sizeof(struct esp_hdr) + sa->iv_len);
>   		memmove(new_ip, ip4, ip_hdr_len);
>   		esp = (struct esp_hdr *)(new_ip + ip_hdr_len);
> +		ip4 = (struct ip *)new_ip;
>   		if (likely(ip4->ip_v == IPVERSION)) {
> -			ip4 = (struct ip *)new_ip;
>   			ip4->ip_p = IPPROTO_ESP;
>   			ip4->ip_len = htons(rte_pktmbuf_data_len(m));
>   		} else {

Acked-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy at intel.com>