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SubjectRe: KASAN: slab-out-of-bounds Write in default_read_copy_kernel
On Sat, 16 Mar 2019 15:49:02 +0100,
syzbot wrote:
>
> syzbot has bisected this bug to:
>
> commit 65766ee0bf7fe8b3be80e2e1c3ef54ad59b29476
> Author: Takashi Iwai <tiwai@suse.de>
> Date: Fri Nov 9 10:59:45 2018 +0000
>
> ALSA: oss: Use kvzalloc() for local buffer allocations
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13ae57db200000
> start commit: 65766ee0 ALSA: oss: Use kvzalloc() for local buffer alloca..
> git tree: upstream
> final crash: https://syzkaller.appspot.com/x/report.txt?x=106e57db200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=17ae57db200000
> kernel config: https://syzkaller.appspot.com/x/.config?x=b9cc5a440391cbfd
> dashboard link: https://syzkaller.appspot.com/bug?extid=12f17c177de05efea72d
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16c27125400000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=152a2a43400000
>
> Reported-by: syzbot+12f17c177de05efea72d@syzkaller.appspotmail.com
> Fixes: 65766ee0 ("ALSA: oss: Use kvzalloc() for local buffer allocations")

This commit itself is no cause, but it's merely a change allowing
finer memory tracking.


thanks,

Takashi

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