linux-kernel - Re: KASAN: null-ptr-deref Read in PageHuge

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Date:   Fri, 18 Sep 2020 21:04:10 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Mike Kravetz <mike.kravetz@...cle.com>
Cc:     syzbot <syzbot+3a21fd5ecfc677248e77@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: null-ptr-deref Read in PageHuge

On Fri, Sep 18, 2020 at 12:42:24PM -0700, Mike Kravetz wrote:
> On 9/18/20 4:02 AM, syzbot wrote:
> > ==================================================================
> > BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline]
> > BUG: KASAN: null-ptr-deref in test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
> > BUG: KASAN: null-ptr-deref in PageCompound include/linux/page-flags.h:196 [inline]
> > BUG: KASAN: null-ptr-deref in PageHuge+0x19/0x170 mm/hugetlb.c:1551
> > Read of size 8 at addr 0000000000000000 by task syz-executor410/6864
> > 
> 
> I assume this would also be fixed by 5d1903f712ac
> ("mm-convert-find_get_entry-to-return-the-head-page-fix")

That's a good bet.