[dpdk-dev] [PATCH] net: check that seg is valid before dereference

[Chas Williams]

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.

Fixes: c442fed81bb9 ("net: add function to calculate checksum in mbuf")

Signed-off-by: Chas Williams <3chas3 at gmail.com>
---
 lib/librte_net/rte_ip.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/librte_net/rte_ip.h b/lib/librte_net/rte_ip.h
index fcd1eb342..6b3e4cdda 100644
--- a/lib/librte_net/rte_ip.h
+++ b/lib/librte_net/rte_ip.h
@@ -225,6 +225,7 @@ rte_raw_cksum_mbuf(const struct rte_mbuf *m, uint32_t off, uint32_t len,
 			break;
 		off -= seglen;
 	}
+	RTE_ASSERT(seg != NULL);
 	seglen -= off;
 	buf = rte_pktmbuf_mtod_offset(seg, const char *, off);
 	if (seglen >= len) {
-- 
2.26.2