linux-kernel - Re: [PATCH] drm/msm: Fix incorrect struct size for memory allocation

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Date:   Thu, 21 Feb 2019 15:08:15 -0700
From:   Jeffrey Hugo <jhugo@...eaurora.org>
To:     Jordan Crouse <jcrouse@...eaurora.org>,
        freedreno@...ts.freedesktop.org
Cc:     linux-arm-msm@...r.kernel.org, stable@...r.kernel.org,
        Sean Paul <sean@...rly.run>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>
Subject: Re: [PATCH] drm/msm: Fix incorrect struct size for memory allocation

On 2/21/2019 2:54 PM, Jordan Crouse wrote:
> The allocation for the clock bulk data does a classic sizeof(pointer)
> instead of sizeof(struct) so the array ends up incorrectly sized
> for the clock data.
> 
> Cc: stable@...r.kernel.org
> Fixes: 8e54eea ("drm/msm: Add a helper function to parse clock names")
> Signed-off-by: Jordan Crouse <jcrouse@...eaurora.org>
> ---
> 
>   drivers/gpu/drm/msm/msm_drv.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 906b2bb..31e1481 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -96,7 +96,7 @@ int msm_clk_bulk_get(struct device *dev, struct clk_bulk_data **bulk)
>   	if (count < 1)
>   		return 0;
>   
> -	local = devm_kcalloc(dev, sizeof(struct clk_bulk_data *),
> +	local = devm_kcalloc(dev, sizeof(struct clk_bulk_data),
>   		count, GFP_KERNEL);
>   	if (!local)
>   		return -ENOMEM;
> 

Isn't msm_clk_bulk_get a duplication of devm_clk_bulk_get_all() ? 
Surely it would be better to just use that instead?

-- 
Jeffrey Hugo
Qualcomm Datacenter Technologies as an affiliate of Qualcomm 
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.