linux-kernel - [PATCH] perf trace: Fix potential USE_AFTER

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190214052356.26884-1-tsu.yubo@gmail.com>
Date:   Thu, 14 Feb 2019 00:23:56 -0500
From:   Bo YU <tsu.yubo@...il.com>
To:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com
Cc:     Bo Yu <tsu.yubo@...il.com>, jolsa@...hat.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] perf trace: Fix potential USE_AFTER_FREE  problem

From: Bo Yu <tsu.yubo@...il.com>

There is a freed pointer "evsel", so fix it.

Detected by CoverityScan, CID#1442595("Memory-illegalaccesses
(USE_AFTER_FREE)")
Fixes: 6ab3bc240ade4("perf trace: Support multiple "vfs_getname" probes")

Signed-off-by: Bo Yu <tsu.yubo@...il.com>
---
 tools/perf/builtin-trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index b36061cd1ab8..4036b20a1067 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2515,7 +2515,7 @@ static size_t trace__fprintf_thread_summary(struct trace *trace, FILE *fp);
 static bool perf_evlist__add_vfs_getname(struct perf_evlist *evlist)
 {
 	bool found = false;
-	struct perf_evsel *evsel, *tmp;
+	struct perf_evsel *evsel = NULL, *tmp;
 	struct parse_events_error err = { .idx = 0, };
 	int ret = parse_events(evlist, "probe:vfs_getname*", &err);
 
-- 
2.11.0