From: Christian Brauner <brauner@kernel.org>
To: syzbot <syzbot+8ac3859139c685c4f597@syzkaller.appspotmail.com>
Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: Re: [syzbot] [fs?] KASAN: null-ptr-deref Read in ida_free (3)
Date: Thu, 30 Mar 2023 08:22:06 +0200 [thread overview]
Message-ID: <20230330-tinsmith-grimace-008b39c60399@brauner> (raw)
In-Reply-To: <00000000000088694505f8132d77@google.com>
On Wed, Mar 29, 2023 at 05:28:55PM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: da8e7da11e4b Merge tag 'nfsd-6.3-4' of git://git.kernel.or..
> git tree: upstream
> console+strace: https://syzkaller.appspot.com/x/log.txt?x=1266331ec80000
> kernel config: https://syzkaller.appspot.com/x/.config?x=acdb62bf488a8fe5
> dashboard link: https://syzkaller.appspot.com/bug?extid=8ac3859139c685c4f597
> compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11639815c80000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12128b1ec80000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/62e9c5f4bead/disk-da8e7da1.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/c11aa933e2a7/vmlinux-da8e7da1.xz
> kernel image: https://storage.googleapis.com/syzbot-assets/7a21bdd49c84/bzImage-da8e7da1.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+8ac3859139c685c4f597@syzkaller.appspotmail.com
This bug deserves a #include <asm-generic/bitops/ffs.h>.
In any case, it might just be advisable to hold namespace_lock() while
cleaning up peer group ids...
#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/vfs/idmapping.git b4/vfs-mount_setattr-propagation-fix
next prev parent reply other threads:[~2023-03-30 6:22 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-30 0:28 [syzbot] [fs?] KASAN: null-ptr-deref Read in ida_free (3) syzbot
2023-03-30 6:22 ` Christian Brauner [this message]
2023-03-30 6:52 ` syzbot
2023-03-30 7:13 ` [PATCH] fs: drop peer group ids under namespace lock Christian Brauner
2023-03-31 10:36 ` Christian Brauner
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