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perf tools: Avoid double free in read_event_file()

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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>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
Cc: Joe Lawrence <joe.lawrence@redhat.com>
Link: http://lkml.kernel.org/r/1538490554-8161-5-git-send-email-sansharm@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Sanskriti Sharma 2018-10-02 10:29:13 -04:00 committed by Arnaldo Carvalho de Melo
parent 9c8a182e5a
commit 470c8f7c88
1 changed files with 1 additions and 3 deletions
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4
tools/perf/util/trace-event-read.c
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@ -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)