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examples/ipsec-secgw: fix IP version check

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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@dpdk.org

Signed-off-by: Tomasz Duszynski <tdu@semihalf.com>
Acked-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy@intel.com>
Reviewed-by: Aviad Yehezkel <aviadye@mellanox.com>
This commit is contained in:
Tomasz Duszynski 2017-10-13 14:50:09 +02:00 committed by Pablo de Lara
parent 9b0b95a48c
commit 3417350e7f
1 changed files with 1 additions and 1 deletions
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2
examples/ipsec-secgw/esp.c
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@ -306,8 +306,8 @@ 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 {