From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Ingo Molnar <mingo@kernel.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: Jiri Olsa <jolsa@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
Clark Williams <williams@redhat.com>,
linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
"Steven Rostedt (VMware)" <rostedt@goodmis.org>,
Andrew Morton <akpm@linux-foundation.org>,
Jiri Olsa <jolsa@redhat.com>,
linux-trace-devel@vger.kernel.org, stable@vger.kernel.org,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 36/37] tools lib traceevent: Do not free tep->cmdlines in add_new_comm() on failure
Date: Thu, 29 Aug 2019 11:39:16 -0300 [thread overview]
Message-ID: <20190829143917.29745-37-acme@kernel.org> (raw)
In-Reply-To: <20190829143917.29745-1-acme@kernel.org>
From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
If the re-allocation of tep->cmdlines succeeds, then the previous
allocation of tep->cmdlines will be freed. If we later fail in
add_new_comm(), we must not free cmdlines, and also should assign
tep->cmdlines to the new allocation. Otherwise when freeing tep, the
tep->cmdlines will be pointing to garbage.
Fixes: a6d2a61ac653a ("tools lib traceevent: Remove some die() calls")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: linux-trace-devel@vger.kernel.org
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20190828191819.970121417@goodmis.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/lib/traceevent/event-parse.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index b36b536a9fcb..13fd9fdf91e0 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -269,10 +269,10 @@ static int add_new_comm(struct tep_handle *tep,
errno = ENOMEM;
return -1;
}
+ tep->cmdlines = cmdlines;
cmdlines[tep->cmdline_count].comm = strdup(comm);
if (!cmdlines[tep->cmdline_count].comm) {
- free(cmdlines);
errno = ENOMEM;
return -1;
}
@@ -283,7 +283,6 @@ static int add_new_comm(struct tep_handle *tep,
tep->cmdline_count++;
qsort(cmdlines, tep->cmdline_count, sizeof(*cmdlines), cmdline_cmp);
- tep->cmdlines = cmdlines;
return 0;
}
--
2.21.0
next parent reply other threads:[~2019-08-29 14:41 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20190829143917.29745-1-acme@kernel.org>
2019-08-29 14:39 ` Arnaldo Carvalho de Melo [this message]
2019-08-29 14:39 ` [PATCH 37/37] tools lib traceevent: Remove unneeded qsort and uses memmove instead Arnaldo Carvalho de Melo
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