linux-kernel - Re: [Intel-gfx] [PATCH][next] drm/i915/pmu: fix sizeof on attr, should be *attr

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 12 Jan 2018 17:48:57 +0000
From:   Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>
To:     Colin King <colin.king@...onical.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [Intel-gfx] [PATCH][next] drm/i915/pmu: fix sizeof on attr,
 should be *attr


Hi,

On 12/01/2018 17:36, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> I believe the sizeof(attr) should be in fact sizeof(*attr), fortunately
> the current code works because sizeof(struct attribute **) is the same
> as sizeof(struct attribute *) for x86.

Thanks, kbuild also reported it and I just pushed a fix.

Out of curiosity, there are platforms where size of pointer is different 
from the size of a pointer to a pointer?

Regards,

Tvrtko

> 
> Detected by CoverityScan, CID#1463854 ("Sizeof not portable")
> 
> Fixes: 109ec558370f ("drm/i915/pmu: Only enumerate available counters in sysfs")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>   drivers/gpu/drm/i915/i915_pmu.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_pmu.c b/drivers/gpu/drm/i915/i915_pmu.c
> index 95ab5e28f5be..9be4f5201e41 100644
> --- a/drivers/gpu/drm/i915/i915_pmu.c
> +++ b/drivers/gpu/drm/i915/i915_pmu.c
> @@ -794,7 +794,7 @@ create_event_attributes(struct drm_i915_private *i915)
>   		goto err_alloc;
>   
>   	/* Max one pointer of each attribute type plus a termination entry. */
> -	attr = kzalloc((count * 2 + 1) * sizeof(attr), GFP_KERNEL);
> +	attr = kzalloc((count * 2 + 1) * sizeof(*attr), GFP_KERNEL);
>   	if (!attr)
>   		goto err_alloc;
>   
>