linux-kernel - Re: [syzbot] WARNING: kmalloc bug in xdp_umem

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Message-ID: <0000000000001f60ef05d7a3c6ad@google.com>
Date:   Wed, 09 Feb 2022 22:08:07 -0800
From:   syzbot <syzbot+11421fbbff99b989670e@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, andrii@...nel.org, ast@...nel.org,
        bjorn.topel@...il.com, bjorn.topel@...el.com, bjorn@...nel.org,
        bpf@...r.kernel.org, daniel@...earbox.net, davem@...emloft.net,
        fgheet255t@...il.com, hawk@...nel.org, john.fastabend@...il.com,
        jonathan.lemon@...il.com, kafai@...com, kpsingh@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        magnus.karlsson@...el.com, mudongliangabcd@...il.com,
        netdev@...r.kernel.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, torvalds@...ux-foundation.org,
        w@....eu, yhs@...com
Subject: Re: [syzbot] WARNING: kmalloc bug in xdp_umem_create (2)

syzbot has bisected this issue to:

commit 7661809d493b426e979f39ab512e3adf41fbcc69
Author: Linus Torvalds <torvalds@...ux-foundation.org>
Date:   Wed Jul 14 16:45:49 2021 +0000

    mm: don't allow oversized kvmalloc() calls

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13bc74c2700000
start commit:   f4bc5bbb5fef Merge tag 'nfsd-5.17-2' of git://git.kernel.o..
git tree:       upstream
final oops:     https://syzkaller.appspot.com/x/report.txt?x=107c74c2700000
console output: https://syzkaller.appspot.com/x/log.txt?x=17bc74c2700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5707221760c00a20
dashboard link: https://syzkaller.appspot.com/bug?extid=11421fbbff99b989670e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12e514a4700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15fcdf8a700000

Reported-by: syzbot+11421fbbff99b989670e@...kaller.appspotmail.com
Fixes: 7661809d493b ("mm: don't allow oversized kvmalloc() calls")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection