[PATCH 1/2] vhost: fix memory leak on realloc failure

[Tiwei Bie <tiwei.bie@intel.com>]

When realloc() fails, the original block isn't freed.

Fixes: e246896178e6 ("vhost: get guest/host physical address mappings")
Cc: stable@dpdk.org

Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
 lib/librte_vhost/vhost_user.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
index 8fec773d5..5222f77dd 100644
--- a/lib/librte_vhost/vhost_user.c
+++ b/lib/librte_vhost/vhost_user.c
@@ -730,13 +730,16 @@ add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 		   uint64_t host_phys_addr, uint64_t size)
 {
 	struct guest_page *page, *last_page;
+	struct guest_page *old_pages;
 
 	if (dev->nr_guest_pages == dev->max_guest_pages) {
 		dev->max_guest_pages *= 2;
+		old_pages = dev->guest_pages;
 		dev->guest_pages = realloc(dev->guest_pages,
 					dev->max_guest_pages * sizeof(*page));
 		if (!dev->guest_pages) {
 			RTE_LOG(ERR, VHOST_CONFIG, "cannot realloc guest_pages\n");
+			free(old_pages);
 			return -1;
 		}
 	}
-- 
2.17.1