[dpdk-dev] [PATCH v4 4/9] mem: fix potential resource leak

Anatoly Burakov anatoly.burakov at intel.com
Fri Apr 27 19:07:05 CEST 2018


We close fd if we managed to find it in the list of allocated
segment lists (which should always be the case under normal
conditions), but if we didn't, the fd was leaking. Close it if
we couldn't find it in the segment list. This is not an issue
as if the segment is zero length, we're getting rid of it
anyway, so there's no harm in not storing the fd anywhere.

Coverity issue: 272568

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

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
Acked-by: Bruce Richardson <bruce.richardson at intel.com>
---

Notes:
    v4:
    - Unconditionally close fd
    - Added comments explaining what happens if we don't remove the file

 lib/librte_eal/linuxapp/eal/eal_memalloc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/linuxapp/eal/eal_memalloc.c b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
index 3391ed1..5ea6dd3 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memalloc.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memalloc.c
@@ -567,12 +567,13 @@ free_seg(struct rte_memseg *ms, struct hugepage_info *hi,
 		 */
 		if (is_zero_length(fd)) {
 			struct msl_entry *te = get_msl_entry_by_idx(list_idx);
-			if (te != NULL && te->fd >= 0) {
-				close(te->fd);
+			/* te->fd is equivalent to fd */
+			if (te != NULL && te->fd >= 0)
 				te->fd = -1;
-			}
 			unlink(path);
+			close(fd);
 		}
+		/* if we're not removing the file, fd stays in the tailq */
 		ret = 0;
 	} else {
 		/* if we're able to take out a write lock, we're the last one
-- 
2.7.4


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