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

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Date:   Thu, 10 Feb 2022 20:56:03 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Björn Töpel <bjorn.topel@...il.com>
Cc:     Daniel Borkmann <daniel@...earbox.net>, Willy Tarreau <w@....eu>,
        syzbot <syzbot+11421fbbff99b989670e@...kaller.appspotmail.com>,
        akpm@...ux-foundation.org, Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        bpf <bpf@...r.kernel.org>, David Miller <davem@...emloft.net>,
        fgheet255t@...il.com, Jesper Dangaard Brouer <hawk@...nel.org>,
        John Fastabend <john.fastabend@...il.com>,
        Jonathan Lemon <jonathan.lemon@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        KP Singh <kpsingh@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
        "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        mudongliangabcd@...il.com, Netdev <netdev@...r.kernel.org>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs@...glegroups.com,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Yonghong Song <yhs@...com>
Subject: Re: [syzbot] WARNING: kmalloc bug in xdp_umem_create (2)

On Thu, Feb 10, 2022 at 08:45:08PM +0300, Dan Carpenter wrote:
> Is it normally going to huge?  You could call vmalloc() instead of
> kvmalloc().

Wait that would make the allocation succeed...  We don't want that.
That was a dumb idea.  Forget I said that.

regards,
dan carpenter