linux-kernel - RE: drm/radeon/dpm: fix uninitialized read from stack in kv_dpm_late

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Date:	Fri, 31 Jan 2014 14:21:56 +0000
From:	"Deucher, Alexander" <Alexander.Deucher@....com>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: RE: drm/radeon/dpm: fix uninitialized read from stack in
 kv_dpm_late_enable

> -----Original Message-----
> From: Dave Jones [mailto:davej@...hat.com]
> Sent: Thursday, January 30, 2014 9:18 PM
> To: Linux Kernel Mailing List
> Cc: Deucher, Alexander
> Subject: drm/radeon/dpm: fix uninitialized read from stack in
> kv_dpm_late_enable
> 
> If we take the false branch of the if quoted in the diff below, we
> end up doing a return ret, without ever having initialized it.
> 
> Picked up by coverity.
> 
> Signed-off-by: Dave Jones <davej@...oraproject.org>

Applied.  Thanks!

Alex

> 
> diff --git a/drivers/gpu/drm/radeon/kv_dpm.c
> b/drivers/gpu/drm/radeon/kv_dpm.c
> index b6e01d5d2cce..351db361239d 100644
> --- a/drivers/gpu/drm/radeon/kv_dpm.c
> +++ b/drivers/gpu/drm/radeon/kv_dpm.c
> @@ -1223,7 +1223,7 @@ int kv_dpm_enable(struct radeon_device *rdev)
> 
>  int kv_dpm_late_enable(struct radeon_device *rdev)
>  {
> -	int ret;
> +	int ret = 0;
> 
>  	if (rdev->irq.installed &&
>  	    r600_is_internal_thermal_sensor(rdev->pm.int_thermal_type)) {


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