linux-kernel - Re: KASAN: use-after-free Write in ext4_mark_inode

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Date:   Fri, 29 Nov 2019 07:55:19 -0500
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     syzbot <syzbot+1e407c24e65e1fca3ecf@...kaller.appspotmail.com>
Cc:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Write in ext4_mark_inode_dirty

On Fri, Nov 29, 2019 at 12:20:10AM -0800, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    a2d79c71 Merge tag 'for-5.3/io_uring-20190711' of git://gi..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1632a03fa00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=bf58f4f254e2639
> dashboard link: https://syzkaller.appspot.com/bug?extid=1e407c24e65e1fca3ecf
> compiler:       clang version 9.0.0 (/home/glider/llvm/clang
> 80fee25776c2fb61e74c1ecb1a523375c2500b69)

#syz dup: KASAN: use-after-free Write in __ext4_expand_extra_isize (2)

     	  	 		      	 - Ted