linux-kernel - Re: [PATCH] soc: apple: rtkit: Fix use-after-free in apple_rtkit_crashlog

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Message-Id: <0e609fea-48b0-4b39-aae4-90395a782ed8@app.fastmail.com>
Date: Tue, 18 Feb 2025 16:34:17 +0100
From: "Sven Peter" <sven@...npeter.dev>
To: "Harshit Mogalapalli" <harshit.m.mogalapalli@...cle.com>,
 "Alyssa Rosenzweig" <alyssa@...enzweig.io>, "Janne Grunau" <j@...nau.net>,
 "Asahi Lina" <lina@...hilina.net>, "Jens Axboe" <axboe@...nel.dk>,
 asahi@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Cc: dan.carpenter@...aro.org, kernel-janitors@...r.kernel.org,
 "Dan Carpenter" <error27@...il.com>
Subject: Re: [PATCH] soc: apple: rtkit: Fix use-after-free in apple_rtkit_crashlog_rx()

Hi,


On Wed, Feb 12, 2025, at 09:58, Harshit Mogalapalli wrote:
> This code calls kfree(bfr); and then passes "bfr" to rtk->ops->crashed()
> which is a use after free.  The ->crashed function pointer is implemented
> by apple_nvme_rtkit_crashed() and it doesn't use the "bfr" pointer so
> this doesn't cause a problem.  But it still looks sketchy as can be.
>
> Fix this by moving kfree() after the last usage of bfr.
>
> Fixes: c559645f343a ("soc: apple: rtkit: Pass the crashlog to the 
> crashed() callback")

This commit isn't upstream yet afaict, did you mean to post a review comment
to [1] instead?


[1] https://lore.kernel.org/asahi/20250202-rtkit-crashdump-v1-1-9d38615b4e12@asahilina.net/


Best,


Sven