linux-kernel - Re: [syzbot] KASAN: stack-out-of-bounds Write in check_move_unevictable

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Date:   Tue, 7 Jun 2022 20:27:26 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     syzbot <syzbot+8847ae8c7bc46bc9c10e@...kaller.appspotmail.com>
Cc:     akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: stack-out-of-bounds Write in
 check_move_unevictable_pages

On Tue, Jun 07, 2022 at 09:24:21AM -0700, syzbot wrote:
> BUG: KASAN: vmalloc-out-of-bounds in folio_batch_add include/linux/pagevec.h:130 [inline]
> BUG: KASAN: vmalloc-out-of-bounds in check_move_unevictable_pages+0x3f6/0x440 mm/vmscan.c:4857

Oh, I forgot to call folio_batch_init(), so ->nr contains some stack
garbage and we index into hyperspace.  I'll fix it up, thanks.