linux-kernel - Re: [PATCH v3] Fixes: null pointer dereference in pfnmap_lockdep

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Message-ID: <yaaz2ctwd2mbirrpeuibmnugdapkalukunjvs2im76mj2q7bk5@bap7dtow4ce7>
Date: Fri, 4 Oct 2024 19:17:37 +0530
From: Manas <manas18244@...td.ac.in>
To: Andrew Morton <akpm@...ux-foundation.org>, 
	Peter Xu <peterx@...hat.com>, Shuah Khan <skhan@...uxfoundation.org>, 
	Anup Sharma <anupnewsmail@...il.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	syzbot+093d096417e7038a689b@...kaller.appspotmail.com
Subject: Re: [PATCH v3] Fixes: null pointer dereference in
 pfnmap_lockdep_assert

On 04.10.2024 19:15, Manas via B4 Relay wrote:
>From: Manas <manas18244@...td.ac.in>
>
>syzbot has pointed to a possible null pointer dereference in
>pfnmap_lockdep_assert. vm_file member of vm_area_struct is being
>dereferenced without any checks.
>
>This fix assigns mapping only if vm_file is not NULL.
I also edited the commit message (and cover letter) slightly to tell about the
newer fix, instead of the v1 fix of returning.

I hope this is okay.

-- 
Manas