linux-kernel - Re: [syzbot] [bluetooth?] KASAN: null-ptr-deref Read in ida

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Date: Sun, 11 Feb 2024 01:55:05 -0800
From: syzbot <syzbot+51baee846ddab52d5230@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, davem@...emloft.net, dvyukov@...gle.com, 
	edumazet@...gle.com, johan.hedberg@...il.com, kuba@...nel.org, 
	linux-bluetooth@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
	linux-kernel@...r.kernel.org, luiz.dentz@...il.com, luiz.von.dentz@...el.com, 
	marcel@...tmann.org, netdev@...r.kernel.org, pabeni@...hat.com, 
	syzkaller-bugs@...glegroups.com, torvalds@...ux-foundation.org, 
	william.xuanziyang@...wei.com, willy@...radead.org, wzhmmmmm@...il.com
Subject: Re: [syzbot] [bluetooth?] KASAN: null-ptr-deref Read in ida_free (4)

syzbot suspects this issue was fixed by commit:

commit af73483f4e8b6f5c68c9aa63257bdd929a9c194a
Author: Matthew Wilcox (Oracle) <willy@...radead.org>
Date:   Thu Dec 21 16:53:57 2023 +0000

    ida: Fix crash in ida_free when the bitmap is empty

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12fc6ba2180000
start commit:   b46ae77f6787 Merge tag 'xfs-6.7-fixes-3' of git://git.kern..
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=6ae1a4ee971a7305
dashboard link: https://syzkaller.appspot.com/bug?extid=51baee846ddab52d5230
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=127837cce80000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=12779dc8e80000

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

#syz fix: ida: Fix crash in ida_free when the bitmap is empty

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