lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Tue, 15 Sep 2020 13:14:56 -0700
From:   Yonghong Song <>
To:     Martin KaFai Lau <>
CC:     <>, Alexei Starovoitov <>,
        Daniel Borkmann <>, <>,
Subject: Re: [PATCH bpf] bpf: bpf_skc_to_* casting helpers require a NULL
 check on sk

On 9/15/20 1:04 PM, Martin KaFai Lau wrote:
> On Tue, Sep 15, 2020 at 11:58:01AM -0700, Yonghong Song wrote:
>> On 9/15/20 11:29 AM, Martin KaFai Lau wrote:
>>> The bpf_skc_to_* type casting helpers are available to
>>> For example, the skb->sk may be NULL.  Thus, these casting helpers
>>> need to check "!sk" also and this patch fixes them.
>>> Fixes: 0d4fad3e57df ("bpf: Add bpf_skc_to_udp6_sock() helper")
>>> Fixes: 478cfbdf5f13 ("bpf: Add bpf_skc_to_{tcp, tcp_timewait, tcp_request}_sock() helpers")
>>> Fixes: af7ec1383361 ("bpf: Add bpf_skc_to_tcp6_sock() helper")
>>> Signed-off-by: Martin KaFai Lau <>
>> Thanks for the fix!
>> Acked-by: Yonghong Song <>
> Thanks for the review.  A follow up question.
> Is PTR_TO_BTF_ID_OR_NULL still needed?

I would still like to preserve PTR_TO_BTF_ID_OR_NULL vs. PTR_TO_BTF_ID
difference for ctx arguments. PTR_TO_BTF_ID_OR_NULL means a NULL check
is required and PTR_TO_BTF_ID means NULL check is not required.

Powered by blists - more mailing lists