Re: [PATCH] exec: do not pass invalid pointer to kfree() from free_bprm()

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To: Mateusz Guzik <mjguzik@xxxxxxxxx>
Subject: Re: [PATCH] exec: do not pass invalid pointer to kfree() from free_bprm()
From: Dmitry Antipov <dmantipov@xxxxxxxxx>
Date: Tue, 5 Nov 2024 16:08:47 +0300
Cc: Tycho Andersen <tandersen@xxxxxxxxxxx>, Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Jan Kara <jack@xxxxxxx>, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, lvc-project@xxxxxxxxxxxxxxxx, syzbot+03e1af5c332f7e0eb84b@xxxxxxxxxxxxxxxxxxxxxxxxx, vbabka@xxxxxxx
In-reply-to: <m4ws43n63iaxuyx7qm667ppsloc63aex34erarrflp6huzlaru@xrpnve3kjluy>
References: <20241105111344.2532040-1-dmantipov@yandex.ru> <m4ws43n63iaxuyx7qm667ppsloc63aex34erarrflp6huzlaru@xrpnve3kjluy>
User-agent: Mozilla Thunderbird

On 11/5/24 2:30 PM, Mateusz Guzik wrote:

The specific instance aside, perhaps kfree could get patched up to
complain about it (when debug is enabled)?


Yes, it may be useful to have WARN_ON() from kfree() for such a case when debugging.

Dmitry

References:
- [PATCH] exec: do not pass invalid pointer to kfree() from free_bprm()
  - From: Dmitry Antipov
- Re: [PATCH] exec: do not pass invalid pointer to kfree() from free_bprm()
  - From: Mateusz Guzik

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