[dpdk-dev] [PATCH 1/3] mbuf: add sanity checks on segment metadata

[David Marchand]

Add some basic checks on the segments offset and length metadata:
always funny to have a < 0 tailroom cast to uint16_t ;-).

Signed-off-by: David Marchand <david.marchand at 6wind.com>
---
 lib/librte_mbuf/rte_mbuf.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/librte_mbuf/rte_mbuf.c b/lib/librte_mbuf/rte_mbuf.c
index e714c5a59..137a320ed 100644
--- a/lib/librte_mbuf/rte_mbuf.c
+++ b/lib/librte_mbuf/rte_mbuf.c
@@ -200,6 +200,11 @@ rte_mbuf_sanity_check(const struct rte_mbuf *m, int is_header)
 	pkt_len = m->pkt_len;
 
 	do {
+		if (m->data_off > m->buf_len)
+			rte_panic("data offset too big in mbuf segment\n");
+		if ((uint32_t)m->data_off + (uint32_t)m->data_len >
+				(uint32_t)m->buf_len)
+			rte_panic("data length too big in mbuf segment\n");
 		nb_segs -= 1;
 		pkt_len -= m->data_len;
 	} while ((m = m->next) != NULL);
-- 
2.17.1