linux-kernel - Re: [syzbot] KASAN: use-after-free Read in __isofs

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Date:   Mon, 18 Oct 2021 12:42:13 +0200
From:   Jan Kara <jack@...e.cz>
To:     syzbot <syzbot+6fc7fb214625d82af7d1@...kaller.appspotmail.com>
Cc:     bingjingc@...ology.com, cccheng@...ology.com, jack@...e.cz,
        linux-kernel@...r.kernel.org, pali@...nel.org,
        robbieko@...ology.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in __isofs_iget

On Fri 15-10-21 17:35:19, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    d3134eb5de85 Add linux-next specific files for 20211011
> git tree:       linux-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=13f5fd98b00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=b9662326d2be383b
> dashboard link: https://syzkaller.appspot.com/bug?extid=6fc7fb214625d82af7d1
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15ca2e47300000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17869bd4b00000
> 
> Bisection is inconclusive: the issue happens on the oldest tested release.
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10808570b00000
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=12808570b00000
> console output: https://syzkaller.appspot.com/x/log.txt?x=14808570b00000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6fc7fb214625d82af7d1@...kaller.appspotmail.com

Let's try this:

#sys test 519d81956ee277b4419c723adfb154603c2565ba

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

View attachment "0001-isofs-Fix-out-of-bound-access-for-corrupted-isofs-im.patch" of type "text/x-patch" (941 bytes)