[dpdk-dev] [PATCH 1/4] net/virtio-user: fix return value not checked

[Jianfeng Tan]

When return values of function calls are not checked, Coverity will
report errors like:

    if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1)
    >>>     CID 127477:    (CHECKED_RETURN)
    >>>     Calling "rte_kvargs_process" without checking return value
            (as is done elsewhere 25 out of 30 times).
         		rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
         				   &get_string_arg, &path);

Coverity issue: 127344, 127478

Fixes: ce2eabdd43ec ("net/virtio-user: add virtual device")
Fixes: 6a84c37e3975 ("net/virtio-user: add vhost-user adapter layer")

Signed-off-by: Jianfeng Tan <jianfeng.tan at intel.com>
---
 drivers/net/virtio/virtio_user/vhost_user.c |  3 +-
 drivers/net/virtio/virtio_user_ethdev.c     | 57 ++++++++++++++++++++++-------
 2 files changed, 45 insertions(+), 15 deletions(-)

diff --git a/drivers/net/virtio/virtio_user/vhost_user.c b/drivers/net/virtio/virtio_user/vhost_user.c
index a2b0687..a159ece 100644
--- a/drivers/net/virtio/virtio_user/vhost_user.c
+++ b/drivers/net/virtio/virtio_user/vhost_user.c
@@ -392,7 +392,8 @@ vhost_user_setup(const char *path)
 	}
 
 	flag = fcntl(fd, F_GETFD);
-	fcntl(fd, F_SETFD, flag | FD_CLOEXEC);
+	if (fcntl(fd, F_SETFD, flag | FD_CLOEXEC) < 0)
+		PMD_DRV_LOG(WARNING, "fcntl failed, %s", strerror(errno));
 
 	memset(&un, 0, sizeof(un));
 	un.sun_family = AF_UNIX;
diff --git a/drivers/net/virtio/virtio_user_ethdev.c b/drivers/net/virtio/virtio_user_ethdev.c
index 5ab2471..8429b2e 100644
--- a/drivers/net/virtio/virtio_user_ethdev.c
+++ b/drivers/net/virtio/virtio_user_ethdev.c
@@ -343,29 +343,58 @@ virtio_user_pmd_devinit(const char *name, const char *params)
 	}
 
 	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_PATH) == 1)
-		rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
-				   &get_string_arg, &path);
+		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_PATH,
+					 &get_string_arg, &path);
+		if (ret < 0) {
+			PMD_INIT_LOG(ERR, "error to parse %s",
+				     VIRTIO_USER_ARG_PATH);
+			goto end;
+		}
 	else {
 		PMD_INIT_LOG(ERR, "arg %s is mandatory for virtio-user\n",
 			  VIRTIO_USER_ARG_QUEUE_SIZE);
 		goto end;
 	}
 
-	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1)
-		rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
-				   &get_string_arg, &mac_addr);
+	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_MAC) == 1) {
+		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_MAC,
+					 &get_string_arg, &mac_addr);
+		if (ret < 0) {
+			PMD_INIT_LOG(ERR, "error to parse %s",
+				     VIRTIO_USER_ARG_MAC);
+			goto end;
+		}
+	}
 
-	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1)
-		rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
-				   &get_integer_arg, &queue_size);
+	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE) == 1) {
+		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUE_SIZE,
+					 &get_integer_arg, &queue_size);
+		if (ret < 0) {
+			PMD_INIT_LOG(ERR, "error to parse %s",
+				     VIRTIO_USER_ARG_QUEUE_SIZE);
+			goto end;
+		}
+	}
 
-	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1)
-		rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
-				   &get_integer_arg, &queues);
+	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_QUEUES_NUM) == 1) {
+		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_QUEUES_NUM,
+					 &get_integer_arg, &queues);
+		if (ret < 0) {
+			PMD_INIT_LOG(ERR, "error to parse %s",
+				     VIRTIO_USER_ARG_QUEUES_NUM);
+			goto end;
+		}
+	}
 
-	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1)
-		rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
-				   &get_integer_arg, &cq);
+	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_CQ_NUM) == 1) {
+		ret = rte_kvargs_process(kvlist, VIRTIO_USER_ARG_CQ_NUM,
+					 &get_integer_arg, &cq);
+		if (ret < 0) {
+			PMD_INIT_LOG(ERR, "error to parse %s",
+				     VIRTIO_USER_ARG_CQ_NUM);
+			goto end;
+		}
+	}
 	else if (queues > 1)
 		cq = 1;
 
-- 
2.1.4