[dpdk-dev] [PATCH v3 3/9] mem: fix potential double close

[Anatoly Burakov <anatoly.burakov@intel.com>]

We were closing descriptor before checking if mapping has
failed, but if it did, we did a second close afterwards. Fix
it by moving closing descriptor to after we check if mmap has
succeeded.

Coverity issue: 272560

Fixes: 2a04139f66b4 ("eal: add single file segments option")
Cc: anatoly.burakov@intel.com

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/linuxapp/eal/eal_memalloc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_memalloc.c b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
index 1f553dd..9156f8b 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memalloc.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
@@ -458,9 +458,6 @@ alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
 	 */
 	void *va = mmap(addr, alloc_sz, PROT_READ | PROT_WRITE,
 			MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd, map_offset);
-	/* for non-single file segments, we can close fd here */
-	if (!internal_config.single_file_segments)
-		close(fd);
 
 	if (va == MAP_FAILED) {
 		RTE_LOG(DEBUG, EAL, "%s(): mmap() failed: %s\n", __func__,
@@ -471,6 +468,9 @@ alloc_seg(struct rte_memseg *ms, void *addr, int socket_id,
 		RTE_LOG(DEBUG, EAL, "%s(): wrong mmap() address\n", __func__);
 		goto mapped;
 	}
+	/* for non-single file segments, we can close fd here */
+	if (!internal_config.single_file_segments)
+		close(fd);
 
 	rte_iova_t iova = rte_mem_virt2iova(addr);
 	if (iova == RTE_BAD_PHYS_ADDR) {
-- 
2.7.4