linux-kernel - [PATCH 4/4] perf util: Fix potential segment fault in put_tracepoints

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Date:   Thu, 21 May 2020 21:32:18 +0800
From:   Wei Li <liwei391@...wei.com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        "Arnaldo Carvalho de Melo" <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, Li Bin <huawei.libin@...wei.com>,
        "Xie XiuQi" <xiexiuqi@...wei.com>,
        Hongbo Yao <yaohongbo@...wei.com>
Subject: [PATCH 4/4] perf util: Fix potential segment fault in put_tracepoints_path

From: Li Bin <huawei.libin@...wei.com>

This patch fix potential segment fault triggerd in put_tracepoints_path
when the address of the local variable 'path' be freed in error path
of record_saved_cmdline.

Signed-off-by: Li Bin <huawei.libin@...wei.com>
---
 tools/perf/util/trace-event-info.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index 086e98ff42a3..0e5c4786f296 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -428,7 +428,7 @@ get_tracepoints_path(struct list_head *pattrs)
 		if (!ppath->next) {
 error:
 			pr_debug("No memory to alloc tracepoints list\n");
-			put_tracepoints_path(&path);
+			put_tracepoints_path(path.next);
 			return NULL;
 		}
 next:
-- 
2.17.1