From: Jakub Sitnicki <jakub@cloudflare.com>
To: Daniel Borkmann <daniel@iogearbox.net>,
"David S. Miller" <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
Alexei Starovoitov <ast@kernel.org>
Cc: Alex Dewar <alex.dewar90@gmail.com>,
John Fastabend <john.fastabend@gmail.com>,
Lorenz Bauer <lmb@cloudflare.com>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andrii@kernel.org>,
KP Singh <kpsingh@chromium.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] net: sockmap: Don't call bpf_prog_put() on NULL pointer
Date: Wed, 14 Oct 2020 11:32:45 +0200 [thread overview]
Message-ID: <877drtqhj6.fsf@cloudflare.com> (raw)
In-Reply-To: <20201012170952.60750-1-alex.dewar90@gmail.com>
On Mon, Oct 12, 2020 at 07:09 PM CEST, Alex Dewar wrote:
> If bpf_prog_inc_not_zero() fails for skb_parser, then bpf_prog_put() is
> called unconditionally on skb_verdict, even though it may be NULL. Fix
> and tidy up error path.
>
> Addresses-Coverity-ID: 1497799: Null pointer dereferences (FORWARD_NULL)
> Fixes: 743df8b7749f ("bpf, sockmap: Check skb_verdict and skb_parser programs explicitly")
> Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
> ---
Note to maintainers: the issue exists only in bpf-next where we have:
https://lore.kernel.org/bpf/160239294756.8495.5796595770890272219.stgit@john-Precision-5820-Tower/
The patch also looks like it is supposed to be applied on top of the above.
next prev parent reply other threads:[~2020-10-14 9:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-12 17:09 [PATCH] net: sockmap: Don't call bpf_prog_put() on NULL pointer Alex Dewar
2020-10-14 9:20 ` Jakub Sitnicki
2020-10-15 4:43 ` John Fastabend
2020-10-15 11:04 ` Jakub Sitnicki
2020-10-14 9:32 ` Jakub Sitnicki [this message]
2020-10-14 9:45 ` Alex Dewar
2020-10-15 19:10 ` patchwork-bot+netdevbpf
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