From: Kees Cook <keescook@chromium.org>
To: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Ido Schimmel <idosch@nvidia.com>, Petr Machata <petrm@nvidia.com>,
"David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH][next] mlxsw: Use size_mul() in call to struct_size()
Date: Fri, 15 Sep 2023 12:42:13 -0700 [thread overview]
Message-ID: <202309151242.E732735FA@keescook> (raw)
In-Reply-To: <ZQSqA80YyLQsnd1L@work>
On Fri, Sep 15, 2023 at 01:01:23PM -0600, Gustavo A. R. Silva wrote:
> If, for any reason, the open-coded arithmetic causes a wraparound, the
> protection that `struct_size()` adds against potential integer overflows
> is defeated. Fix this by hardening call to `struct_size()` with `size_mul()`.
>
> Fixes: 2285ec872d9d ("mlxsw: spectrum_acl_bloom_filter: use struct_size() in kzalloc()")
> Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
next prev parent reply other threads:[~2023-09-15 19:42 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-15 19:01 [PATCH][next] mlxsw: Use size_mul() in call to struct_size() Gustavo A. R. Silva
2023-09-15 19:42 ` Kees Cook [this message]
2023-09-18 7:31 ` Ido Schimmel
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