linux-kernel - Re: [PATCH] leds: gpio: Set num

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Message-ID: <202408221713.77EF78D1@keescook>
Date: Thu, 22 Aug 2024 17:14:16 -0700
From: Kees Cook <kees@...nel.org>
To: Lee Jones <lee@...nel.org>
Cc: "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
	Pavel Machek <pavel@....cz>, linux-leds@...r.kernel.org,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] leds: gpio: Set num_leds after allocation

On Thu, Jul 25, 2024 at 11:22:40AM +0100, Lee Jones wrote:
> On Tue, 16 Jul 2024, Gustavo A. R. Silva wrote:
> 
> > 
> > 
> > On 16/07/24 15:24, Kees Cook wrote:
> > > With the new __counted_by annotation, the "num_leds" variable needs to
> > > valid for accesses to the "leds" array. This requirement is not met in
> > > gpio_leds_create(), since "num_leds" starts at "0", so "leds" index "0"
> > > will not be considered valid (num_leds would need to be "1" to access
> > > index "0").
> > > 
> > > Fix this by setting the allocation size after allocation, and then update
> > > the final count based on how many were actually added to the array.
> > > 
> > > Fixes: 52cd75108a42 ("leds: gpio: Annotate struct gpio_leds_priv with __counted_by")
> > > Signed-off-by: Kees Cook <kees@...nel.org>
> > 
> > Reviewed-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> > 
> > Thanks
> > -- 
> 
> Using the signature tag in the middle of an email turns the remainder of
> the body into a signature block, which is odd to say the least.  By all
> means sign-off in the middle of a mail, but please refrain from
> converting the rest of the mail.

Ping. Shall I take this via the hardening tree?

-Kees

-- 
Kees Cook