[dpdk-dev] [PATCH] net/netvsc: replace compiler builtin overflow check
Ferruh Yigit
ferruh.yigit at intel.com
Tue Sep 8 12:06:42 CEST 2020
'__builtin_add_overflow' added to gcc in version 5, earlier versions
causing build error, like gcc 4.8.5 in RHEL7.
Replaced compiler builtin check with arithmetic check.
Fixes: cabb3c0f29f1 ("net/netvsc: check for overflow on packet info from host")
Reported-by: Raslan Darawsheh <rasland at mellanox.com>
Signed-off-by: Ferruh Yigit <ferruh.yigit at intel.com>
---
drivers/net/netvsc/hn_rxtx.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index d8d3f07f56..3e8d3b407d 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -666,7 +666,7 @@ static void hn_rndis_rx_data(struct hn_rx_queue *rxq,
struct hn_rx_bufinfo *rxb,
void *data, uint32_t dlen)
{
- unsigned int data_off, data_len, total_len;
+ unsigned int data_off, data_len;
unsigned int pktinfo_off, pktinfo_len;
const struct rndis_packet_msg *pkt = data;
struct hn_rxinfo info = {
@@ -712,8 +712,8 @@ static void hn_rndis_rx_data(struct hn_rx_queue *rxq,
goto error;
}
- if (__builtin_add_overflow(data_off, data_len, &total_len) ||
- total_len > pkt->len)
+ /* overflow check */
+ if (data_len > data_len + data_off || data_len + data_off > pkt->len)
goto error;
if (unlikely(data_len < RTE_ETHER_HDR_LEN))
--
2.25.4
More information about the dev
mailing list