linux-kernel - Re: [PATCH] tools lib traceevent: Fix double free in event_read

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Date:   Fri, 21 Oct 2022 09:01:26 +0800
From:   shangxiaojing <shangxiaojing@...wei.com>
To:     Steven Rostedt <rostedt@...dmis.org>
CC:     <acme@...hat.com>, <linux-kernel@...r.kernel.org>,
        <namhyung@...nel.org>
Subject: Re: [PATCH] tools lib traceevent: Fix double free in
 event_read_fields()



On 2022/10/21 5:23, Steven Rostedt wrote:
> On Mon, 17 Oct 2022 16:59:37 +0800
> Shang XiaoJing <shangxiaojing@...wei.com> wrote:
> 
>> There is a double free in event_read_fields(). After calling free_token()
>> to free the token, if append() failed, then goto fail, which will call
>> free_token() again. Triggered by compiling with perf and run "perf sched
>> record". Fix the double free by goto fail_expect instead of fail while
>> append() failed, which won't call redundant free_token().
>>
>> BUG: double free
>> free(): double free detected in tcache 2
>> Aborted
>>
>> Fixes: d286447f23cd ("tools lib traceevent: Handle realloc() failure path")
>> Signed-off-by: Shang XiaoJing <shangxiaojing@...wei.com>
>> ---
>>   tools/lib/traceevent/event-parse.c | 2 +-
> 
> tool/lib/traceevent is deprecated.
> 
> Can you send this patch to linux-trace-devel@...r.kernel.org against
> 
>    https://git.kernel.org/pub/scm/libs/libtrace/libtraceevent.git/
> 
ok, thanks for the reminder.

Thanks,
-- 
Shang XiaoJing