[dpdk-stable] [PATCH] gro: fix overflow of payload length calculation

[Jiayu Hu]

When the packet length is smaller than the header length,
the calculated payload length will be overflowed and result
in incorrect reassembly behaviors.

Fixes: 1e4cf4d6d4fb ("gro: cleanup")
Fixes: 9e0b9d2ec0f4 ("gro: support VxLAN GRO")
Cc: stable at dpdk.org

Signed-off-by: Jiayu Hu <jiayu.hu at intel.com>
---
 lib/librte_gro/gro_tcp4.c       | 3 ++-
 lib/librte_gro/gro_vxlan_tcp4.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/librte_gro/gro_tcp4.c b/lib/librte_gro/gro_tcp4.c
index 2c0f35c..2fe9aab 100644
--- a/lib/librte_gro/gro_tcp4.c
+++ b/lib/librte_gro/gro_tcp4.c
@@ -198,7 +198,8 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt,
 	struct ipv4_hdr *ipv4_hdr;
 	struct tcp_hdr *tcp_hdr;
 	uint32_t sent_seq;
-	uint16_t tcp_dl, ip_id, hdr_len, frag_off;
+	int32_t tcp_dl;
+	uint16_t ip_id, hdr_len, frag_off;
 	uint8_t is_atomic;
 
 	struct tcp4_flow_key key;
diff --git a/lib/librte_gro/gro_vxlan_tcp4.c b/lib/librte_gro/gro_vxlan_tcp4.c
index ca86f01..955ae4b 100644
--- a/lib/librte_gro/gro_vxlan_tcp4.c
+++ b/lib/librte_gro/gro_vxlan_tcp4.c
@@ -295,7 +295,8 @@ gro_vxlan_tcp4_reassemble(struct rte_mbuf *pkt,
 	struct udp_hdr *udp_hdr;
 	struct vxlan_hdr *vxlan_hdr;
 	uint32_t sent_seq;
-	uint16_t tcp_dl, frag_off, outer_ip_id, ip_id;
+	int32_t tcp_dl;
+	uint16_t frag_off, outer_ip_id, ip_id;
 	uint8_t outer_is_atomic, is_atomic;
 
 	struct vxlan_tcp4_flow_key key;
-- 
2.7.4