From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Song Liu <songliubraving@fb.com>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Alexei Starovoitov <ast@kernel.org>,
Peilin Ye <yepeilin.cs@gmail.com>,
syzkaller-bugs <syzkaller-bugs@googlegroups.com>,
clang-built-linux <clang-built-linux@googlegroups.com>,
Networking <netdev@vger.kernel.org>,
KP Singh <kpsingh@chromium.org>, Yonghong Song <yhs@fb.com>,
bpf <bpf@vger.kernel.org>, Andrii Nakryiko <andriin@fb.com>,
Martin KaFai Lau <kafai@fb.com>,
open list <linux-kernel@vger.kernel.org>,
linux-kernel-mentees@lists.linuxfoundation.org
Subject: Re: [Linux-kernel-mentees] [PATCH v2] bpf: Fix NULL pointer dereference in __btf_resolve_helper_id()
Date: Tue, 14 Jul 2020 10:27:42 -0700 [thread overview]
Message-ID: <CAADnVQ+jUPGJapkvKW=AfXESD6Vz2iuONvJm8eJm5Yd+u9mJ+w@mail.gmail.com> (raw)
In-Reply-To: <CAEf4Bzas-C7hKX=AutcV1fz-F_q2P8+OCnrA37h-nCytLHPn1g@mail.gmail.com>
On Mon, Jul 13, 2020 at 9:38 PM Andrii Nakryiko
<andrii.nakryiko@gmail.com> wrote:
>
> On Mon, Jul 13, 2020 at 6:29 PM Peilin Ye <yepeilin.cs@gmail.com> wrote:
> >
> > Prevent __btf_resolve_helper_id() from dereferencing `btf_vmlinux`
> > as NULL. This patch fixes the following syzbot bug:
> >
> > https://syzkaller.appspot.com/bug?id=5edd146856fd513747c1992442732e5a0e9ba355
The link looks wrong?
Nothing in the stack trace indicates this issue.
> > Reported-by: syzbot+ee09bda7017345f1fbe6@syzkaller.appspotmail.com
> > Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com>
> > ---
> > Thank you for reviewing my patch! I am new to Linux kernel development; would
> > the log message and errno be appropriate for this case?
>
> I think it's good enough, thanks for the fix.
>
> Acked-by: Andrii Nakryiko <andriin@fb.com>
>
> >
> > Change in v2:
> > - Split NULL and IS_ERR cases.
> >
> > kernel/bpf/btf.c | 5 +++++
> > 1 file changed, 5 insertions(+)
> >
>
> [...]
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next prev parent reply other threads:[~2020-07-14 17:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-14 0:38 [Linux-kernel-mentees] [PATCH] bpf: Fix NULL pointer dereference in __btf_resolve_helper_id() Peilin Ye
2020-07-14 0:53 ` Andrii Nakryiko
2020-07-14 1:27 ` [Linux-kernel-mentees] [PATCH v2] " Peilin Ye
2020-07-14 4:37 ` Andrii Nakryiko
2020-07-14 17:27 ` Alexei Starovoitov [this message]
2020-07-14 18:09 ` [Linux-kernel-mentees] [PATCH v3] " Peilin Ye
2020-07-15 21:07 ` Daniel Borkmann
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