linux-kernel - [PATCH AUTOSEL 4.9 13/18] perf kmem: Fix memory leak in compact_gfp

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Message-Id: <20191030155700.10748-13-sashal@kernel.org>
Date:   Wed, 30 Oct 2019 11:56:55 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yunfeng Ye <yeyunfeng@...wei.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Feilong Lin <linfeilong@...wei.com>,
        Hu Shiyuan <hushiyuan@...wei.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 4.9 13/18] perf kmem: Fix memory leak in compact_gfp_flags()

From: Yunfeng Ye <yeyunfeng@...wei.com>

[ Upstream commit 1abecfcaa7bba21c9985e0136fa49836164dd8fd ]

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@...wei.com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Feilong Lin <linfeilong@...wei.com>
Cc: Hu Shiyuan <hushiyuan@...wei.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lore.kernel.org/lkml/f9e9f458-96f3-4a97-a1d5-9feec2420e07@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 d426dcb18ce9a..496a4ca116671 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -674,6 +674,7 @@ 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;
 			}
 
-- 
2.20.1