linux-kernel - Re: [syzbot] [fs?] KASAN: null-ptr-deref Write in do_pagemap

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Message-ID: <685c84d5.a00a0220.2e5631.01a8.GAE@google.com>
Date: Wed, 25 Jun 2025 16:23:01 -0700
From: syzbot <syzbot+02e64be5307d72e9c309@...kaller.appspotmail.com>
To: adrian.ratiu@...labora.com, akpm@...ux-foundation.org, andrii@...nel.org, 
	brauner@...nel.org, david@...hat.com, eadavis@...com, 
	felix.moessbauer@...mens.com, jlayton@...nel.org, 
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
	lorenzo.stoakes@...cle.com, mjguzik@...il.com, superman.xpt@...il.com, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de, viro@...iv.linux.org.uk, 
	xu.xin16@....com.cn
Subject: Re: [syzbot] [fs?] KASAN: null-ptr-deref Write in do_pagemap_cmd

syzbot suspects this issue was fixed by commit:

commit 65c66047259fad1b868d4454bc5af95b46a5f954
Author: Penglei Jiang <superman.xpt@...il.com>
Date:   Fri Apr 4 06:33:57 2025 +0000

    proc: fix the issue of proc_mem_open returning NULL

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1604cf0c580000
start commit:   80e54e84911a Linux 6.14-rc6
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=77b023e9ae0dbb6a
dashboard link: https://syzkaller.appspot.com/bug?extid=02e64be5307d72e9c309
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=101e3b8c580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11ec67a8580000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: proc: fix the issue of proc_mem_open returning NULL

For information about bisection process see: https://goo.gl/tpsmEJ#bisection