linux-kernel - Re: [PATCH RESEND] bpf: fix order of args in call to bpf_map

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Date: Wed, 12 Jun 2024 07:53:00 -0700
From: Alexei Starovoitov <alexei.starovoitov@...il.com>
To: Mohammad Shehar Yaar Tausif <sheharyaar48@...il.com>
Cc: Martin KaFai Lau <martin.lau@...ux.dev>, Alexei Starovoitov <ast@...nel.org>, 
	Daniel Borkmann <daniel@...earbox.net>, Andrii Nakryiko <andrii@...nel.org>, 
	Eduard Zingerman <eddyz87@...il.com>, Song Liu <song@...nel.org>, 
	Yonghong Song <yonghong.song@...ux.dev>, John Fastabend <john.fastabend@...il.com>, 
	KP Singh <kpsingh@...nel.org>, Stanislav Fomichev <sdf@...gle.com>, Hao Luo <haoluo@...gle.com>, 
	Jiri Olsa <jolsa@...nel.org>, bpf <bpf@...r.kernel.org>, 
	LKML <linux-kernel@...r.kernel.org>, 
	Javier Carrasco <javier.carrasco.cruz@...il.com>
Subject: Re: [PATCH RESEND] bpf: fix order of args in call to bpf_map_kvcalloc

On Wed, Jun 12, 2024 at 2:51 AM Mohammad Shehar Yaar Tausif
<sheharyaar48@...il.com> wrote:
>
> The original function call passed size of smap->bucket before the number of
> buckets which raises the error 'calloc-transposed-args' on compilation.
>
> Fixes: 62827d612ae5 ("bpf: Remove __bpf_local_storage_map_alloc")
> Reviewed-by: Andrii Nakryiko <andrii@...nel.org>
> Signed-off-by: Mohammad Shehar Yaar Tausif <sheharyaar48@...il.com>
> ---
> - already merged in linux-next
> - [1] suggested sending as a fix for 6.10 cycle

No. It's not a fix.

pw-bot: cr

>
> [1] https://lore.kernel.org/all/363ad8d1-a2d2-4fca-b66a-3d838eb5def9@intel.com/
> ---
>  kernel/bpf/bpf_local_storage.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/bpf/bpf_local_storage.c b/kernel/bpf/bpf_local_storage.c
> index 976cb258a0ed..c938dea5ddbf 100644
> --- a/kernel/bpf/bpf_local_storage.c
> +++ b/kernel/bpf/bpf_local_storage.c
> @@ -782,8 +782,8 @@ bpf_local_storage_map_alloc(union bpf_attr *attr,
>         nbuckets = max_t(u32, 2, nbuckets);
>         smap->bucket_log = ilog2(nbuckets);
>
> -       smap->buckets = bpf_map_kvcalloc(&smap->map, sizeof(*smap->buckets),
> -                                        nbuckets, GFP_USER | __GFP_NOWARN);
> +       smap->buckets = bpf_map_kvcalloc(&smap->map, nbuckets,
> +                                        sizeof(*smap->buckets), GFP_USER | __GFP_NOWARN);
>         if (!smap->buckets) {
>                 err = -ENOMEM;
>                 goto free_smap;
>
> ---
> base-commit: 2ef5971ff345d3c000873725db555085e0131961
> change-id: 20240612-master-fe9e63ab5c95
>
> Best regards,
> --
> Mohammad Shehar Yaar Tausif <sheharyaar48@...il.com>
>