linux-hardening - Re: [PATCH] net/mlx5: DR, Prefer kcalloc over open coded arithmetic

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Date:   Mon, 20 Sep 2021 21:19:05 +0000
From:   Saeed Mahameed <saeedm@...dia.com>
To:     "len.baker@....com" <len.baker@....com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "leon@...nel.org" <leon@...nel.org>
CC:     "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        Erez Shitrit <erezsh@...dia.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        Yevgeny Kliteynik <kliteyn@...dia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Alex Vesker <valex@...dia.com>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jianbo Liu <jianbol@...dia.com>
Subject: Re: [PATCH] net/mlx5: DR, Prefer kcalloc over open coded arithmetic

On Sun, 2021-09-05 at 09:49 +0200, Len Baker wrote:
> As noted in the "Deprecated Interfaces, Language Features,
> Attributes,
> and Conventions" documentation [1], size calculations (especially
> multiplication) should not be performed in memory allocator (or
> similar)
> function arguments due to the risk of them overflowing. This could
> lead
> to values wrapping around and a smaller allocation being made than
> the
> caller was expecting. Using those allocations could lead to linear
> overflows of heap memory and other misbehaviors.
> 
> So, refactor the code a bit to use the purpose specific kcalloc()
> function instead of the argument size * count in the kzalloc()
> function.
> 
> [1]
> https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
> 
> Signed-off-by: Len Baker <len.baker@....com>

applied to net-next-mlx5,

Thanks.