net: check segment pointer in raw checksum processing

If the overall pkt_len and segment lengths are out of agreement,
it is possible for the seg to be NULL after the loop. Add assert
to check this condition in debug builds. Otherwise, return failure.

Fixes: c442fed81bb9 ("net: add function to calculate checksum in mbuf")
Cc: stable@dpdk.org
Signed-off-by: Chas Williams <3chas3@gmail.com>

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index bb55ebb..8382d0f 100644 (file)
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -225,6 +225,9 @@ rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len,
                        break;
                off -= seglen;
        }
+       RTE_ASSERT(seg != NULL);
+       if (seg == NULL)
+               return -1;
        seglen -= off;
        buf = rte_pktmbuf_mtod_offset(seg, const char *, off);
        if (seglen >= len) {