[tip: perf/urgent] perf kmem: Fix memory leak in compact_gfp_flags()

[tip-bot2 for Yunfeng Ye]

The following commit has been merged into the perf/urgent branch of tip:

Commit-ID:     1abecfcaa7bba21c9985e0136fa49836164dd8fd
Gitweb:        https://git.kernel.org/tip/1abecfcaa7bba21c9985e0136fa49836164dd8fd
Author:        Yunfeng Ye <yeyunfeng@xxxxxxxxxx>
AuthorDate:    Wed, 16 Oct 2019 16:38:45 +08:00
Committer:     Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitterDate: Wed, 16 Oct 2019 10:08:32 -03:00

perf kmem: Fix memory leak in compact_gfp_flags()

The memory @orig_flags is allocated by strdup(), it is freed on the
normal path, but leak to free on the error path.

Fix this by adding free(orig_flags) on the error path.

Fixes: 0e11115644b3 ("perf kmem: Print gfp flags in human readable string")
Signed-off-by: Yunfeng Ye <yeyunfeng@xxxxxxxxxx>
Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Cc: Feilong Lin <linfeilong@xxxxxxxxxx>
Cc: Hu Shiyuan <hushiyuan@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lore.kernel.org/lkml/f9e9f458-96f3-4a97-a1d5-9feec2420e07@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
 tools/perf/builtin-kmem.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index 1e61e35..9661671 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -691,6 +691,7 @@ static char *compact_gfp_flags(char *gfp_flags)
 			new = realloc(new_flags, len + strlen(cpt) + 2);
 			if (new == NULL) {
 				free(new_flags);
+				free(orig_flags);
 				return NULL;
 			}