[PATCH v3 5/9] net/memif: unwind partial device on create failure

[Sriram Yagnaraman]

memif_create() returned -1 directly when the process-private allocation
or memif_socket_init() failed, leaving the port allocated by
rte_eth_vdev_allocate() registered and the process-private memory
leaked. Jump to an error label that frees the process-private data and
releases the port instead.

Fixes: 09c7e63a71f9 ("net/memif: introduce memory interface PMD")
Fixes: c41a04958b09 ("net/memif: support multi-process")
Cc: stable at dpdk.org

Signed-off-by: Sriram Yagnaraman <sriram.yagnaraman at ericsson.com>
---
 drivers/net/memif/rte_eth_memif.c | 27 +++++++++++++++++----------
 1 file changed, 17 insertions(+), 10 deletions(-)

diff --git a/drivers/net/memif/rte_eth_memif.c b/drivers/net/memif/rte_eth_memif.c
index 70359554e6..e70443976d 100644
--- a/drivers/net/memif/rte_eth_memif.c
+++ b/drivers/net/memif/rte_eth_memif.c
@@ -1957,18 +1957,18 @@ memif_create(struct rte_vdev_device *vdev, enum memif_role_t role,
 	const unsigned int numa_node = vdev->device.numa_node;
 	const char *name = rte_vdev_device_name(vdev);
 
+	/* Allocate process-private data before reserving the port. */
+	process_private = rte_zmalloc(name, sizeof(struct pmd_process_private),
+				      RTE_CACHE_LINE_SIZE);
+	if (process_private == NULL) {
+		MIF_LOG(ERR, "Failed to alloc memory for process private");
+		return -ENOMEM;
+	}
+
 	eth_dev = rte_eth_vdev_allocate(vdev, sizeof(*pmd));
 	if (eth_dev == NULL) {
 		MIF_LOG(ERR, "%s: Unable to allocate device struct.", name);
-		return -1;
-	}
-
-	process_private = (struct pmd_process_private *)
-		rte_zmalloc(name, sizeof(struct pmd_process_private),
-			    RTE_CACHE_LINE_SIZE);
-
-	if (process_private == NULL) {
-		MIF_LOG(ERR, "Failed to alloc memory for process private");
+		rte_free(process_private);
 		return -1;
 	}
 	eth_dev->process_private = process_private;
@@ -1988,7 +1988,7 @@ memif_create(struct rte_vdev_device *vdev, enum memif_role_t role,
 
 	ret = memif_socket_init(eth_dev, socket_filename);
 	if (ret < 0)
-		return ret;
+		goto error;
 
 	memset(pmd->secret, 0, sizeof(char) * ETH_MEMIF_SECRET_SIZE);
 	if (secret != NULL)
@@ -2023,6 +2023,13 @@ memif_create(struct rte_vdev_device *vdev, enum memif_role_t role,
 	rte_eth_dev_probing_finish(eth_dev);
 
 	return 0;
+
+error:
+	/* rte_eth_dev_release_port() does not free process_private. */
+	rte_free(eth_dev->process_private);
+	eth_dev->process_private = NULL;
+	rte_eth_dev_release_port(eth_dev);
+	return ret;
 }
 
 static int
-- 
2.43.7