From: John Fastabend <john.fastabend@gmail.com>
To: Wang Qing <wangqing@vivo.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andrii@kernel.org>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@chromium.org>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: Wang Qing <wangqing@vivo.com>
Subject: RE: [PATCH v3 bpf] trace: bpf: Fix passing zero to PTR_ERR()
Date: Mon, 09 Nov 2020 13:18:01 -0800 [thread overview]
Message-ID: <5fa9b209b7eeb_8c0e208f3@john-XPS-13-9370.notmuch> (raw)
In-Reply-To: <1604735144-686-1-git-send-email-wangqing@vivo.com>
Wang Qing wrote:
> There is a bug when passing zero to PTR_ERR() and return.
> Fix smatch err.
>
> Signed-off-by: Wang Qing <wangqing@vivo.com>
> ---
> kernel/trace/bpf_trace.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
> index 4517c8b..5113fd4
> --- a/kernel/trace/bpf_trace.c
> +++ b/kernel/trace/bpf_trace.c
> @@ -1198,7 +1198,7 @@ static int bpf_btf_printf_prepare(struct btf_ptr *ptr, u32 btf_ptr_size,
> *btf = bpf_get_btf_vmlinux();
>
> if (IS_ERR_OR_NULL(*btf))
> - return PTR_ERR(*btf);
> + return IS_ERR(*btf) ? PTR_ERR(*btf) : -EINVAL;
>
> if (ptr->type_id > 0)
> *btf_id = ptr->type_id;
> --
> 2.7.4
>
Acked-by: John Fastabend <john.fastabend@gmail.com>
prev parent reply other threads:[~2020-11-09 21:18 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-07 7:45 [PATCH v3 bpf] trace: bpf: Fix passing zero to PTR_ERR() Wang Qing
2020-11-07 18:08 ` Yonghong Song
2020-11-09 21:18 ` John Fastabend [this message]
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