linux-kernel - Re: [PATCH] module: Fix use-after-free bug in read_file_mod

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Date:   Mon, 22 May 2023 14:21:46 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
Cc:     linux-modules@...r.kernel.org, linux-kernel@...r.kernel.org,
        error27@...il.com, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] module: Fix use-after-free bug in read_file_mod_stats()

On Thu, Apr 27, 2023 at 10:59:33PM -0700, Harshit Mogalapalli wrote:
> Smatch warns:
> 	kernel/module/stats.c:394 read_file_mod_stats()
> 	warn: passing freed memory 'buf'
> 
> We are passing 'buf' to simple_read_from_buffer() after freeing it.
> 
> Fix this by changing the order of 'simple_read_from_buffer' and 'kfree'.
> 
> Fixes: df3e764d8e5c ("module: add debug stats to help identify memory pressure")
> Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
> ---

Queued up, thanks!

  Luis