net/virtio: fix getline memory leakage

[ upstream commit 9f52837 ]

This patch fixes getline memory leakage when parsing dynamic major num.

Fixes: 7d62bf6 ("net/virtio: introduce vhost-vDPA backend type")

Signed-off-by: Chengwen Feng <fengchengwen@huawei.com>
Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
Reviewed-by: Chenbo Xia <chenbo.xia@intel.com>

drivers/net/virtio/virtio_user_ethdev.c

@@ -584,7 +584,7 @@ vdpa_dynamic_major_num(void)
 {
 	FILE *fp;
 	char *line = NULL;
-	size_t size;
+	size_t size = 0;
 	char name[11];
 	bool found = false;
 	uint32_t num;
@@ -604,6 +604,7 @@ vdpa_dynamic_major_num(void)
 			break;
 		}
 	}
+	free(line);
 	fclose(fp);
 	return found ? num : UNNAMED_MAJOR;
 }