[dpdk-dev] [PATCH v8 3/5] net/virtio-user: fix devargs parsing

Ivan Dyukov i.dyukov at samsung.com
Mon Mar 30 09:58:00 CEST 2020


strtoull returns 0 if it fails to parse input string. It's ignored
in get_integer_arg.

This patch handles error cases for strtoull function.

Signed-off-by: Ivan Dyukov <i.dyukov at samsung.com>
---
 drivers/net/virtio/virtio_user_ethdev.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index e61af4068..a79f68a36 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -477,12 +477,17 @@ static int
 get_integer_arg(const char *key __rte_unused,
 		const char *value, void *extra_args)
 {
+	uint64_t integer = 0;
 	if (!value || !extra_args)
 		return -EINVAL;
-
-	*(uint64_t *)extra_args = strtoull(value, NULL, 0);
-
-	return 0;
+	errno = 0;
+	integer = strtoull(value, NULL, 0);
+	/* extra_args keeps default value, it should be replaced
+	 * only in case of successful parsing of the 'value' arg
+	 */
+	if (errno == 0)
+		*(uint64_t *)extra_args = integer;
+	return -errno;
 }
 
 static struct rte_eth_dev *
-- 
2.17.1



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