Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Sanskriti Sharma <sansharm@redhat.com>
To:     linux-kernel@vger.kernel.org
Cc:     Jiri Olsa <jolsa@redhat.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>,
        Joe Lawrence <joe.lawrence@redhat.com>
Subject: [PATCH 4/5] perf tools: avoid double free in read_event_file()
Date:   Tue,  2 Oct 2018 10:29:13 -0400
Message-Id: <1538490554-8161-5-git-send-email-sansharm@redhat.com>
In-Reply-To: <1538490554-8161-1-git-send-email-sansharm@redhat.com>
References: <1538490554-8161-1-git-send-email-sansharm@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

The temporary 'buf' buffer allocated in read_event_file() may be freed
twice.  Move the free() call to the common function exit point.

Fixes the following coverity complaints:

  Error: USE_AFTER_FREE (CWE-825):
  tools/perf/util/trace-event-read.c:309: double_free: Calling "free"
  frees pointer "buf" which has already been freed.

Signed-off-by: Sanskriti Sharma <sansharm@redhat.com>
---
 tools/perf/util/trace-event-read.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index 3dfc1db..6a0d0f2 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -297,10 +297,8 @@ static int read_event_file(struct tep_handle *pevent, char *sys,
 	}
 
 	ret = do_read(buf, size);
-	if (ret < 0) {
-		free(buf);
+	if (ret < 0)
 		goto out;
-	}
 
 	ret = parse_event_file(pevent, buf, size, sys);
 	if (ret < 0)
-- 
1.8.3.1