netdev - Re: [PATCH bpf-next 2/2] bpftool: Fix error check when calling hashmap_

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Date:   Fri, 7 Jan 2022 18:02:38 +0000
From:   Quentin Monnet <quentin@...valent.com>
To:     Mauricio Vásquez <mauricio@...volk.io>,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH bpf-next 2/2] bpftool: Fix error check when calling
 hashmap__new()

2022-01-07 10:26 UTC-0500 ~ Mauricio Vásquez <mauricio@...volk.io>
> hashmap__new() encodes errors with ERR_PTR(), hence it's not valid to
> check the returned pointer against NULL and IS_ERR() has to be used
> instead.
> 
> libbpf_get_error() can't be used in this case as hashmap__new() is not
> part of the public libbpf API and it'll continue using ERR_PTR() after
> libbpf 1.0.
> 
> Fixes: 8f184732b60b ("bpftool: Switch to libbpf's hashmap for pinned paths of BPF objects")
> Fixes: 2828d0d75b73 ("bpftool: Switch to libbpf's hashmap for programs/maps in BTF listing")
> Fixes: d6699f8e0f83 ("bpftool: Switch to libbpf's hashmap for PIDs/names references")
> 
> Signed-off-by: Mauricio Vásquez <mauricio@...volk.io>

This looks good to me, thank you for the fix!

Reviewed-by: Quentin Monnet <quentin@...valent.com>