linux-kernel - Re: [PATCH][next] drm/v3d: fix double free of bin

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Date:   Thu, 24 Oct 2019 14:38:53 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Colin King <colin.king@...onical.com>
Cc:     Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Navid Emamdoost <navid.emamdoost@...il.com>,
        Iago Toral Quiroga <itoral@...lia.com>,
        dri-devel@...ts.freedesktop.org, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] drm/v3d: fix double free of bin

On Thu, Oct 24, 2019 at 11:48:01AM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Two different fixes have addressed the same memory leak of bin and
> this now causes a double free of bin.  While the individual memory
> leak fixes are fine, both fixes together are problematic.
> 
> Addresses-Coverity: ("Double free")
> Fixes: 29cd13cfd762 ("drm/v3d: Fix memory leak in v3d_submit_cl_ioctl")
> Fixes: 0d352a3a8a1f (" rm/v3d: don't leak bin job if v3d_job_init fails.")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

That sounds like wrong merge resolution somewhere, and we don't have those
patches merged together in any final tree yet anywhere. What's this based
on?
-Daniel

> ---
>  drivers/gpu/drm/v3d/v3d_gem.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
> index 549dde83408b..37515e47b47e 100644
> --- a/drivers/gpu/drm/v3d/v3d_gem.c
> +++ b/drivers/gpu/drm/v3d/v3d_gem.c
> @@ -568,7 +568,6 @@ v3d_submit_cl_ioctl(struct drm_device *dev, void *data,
>  		ret = v3d_job_init(v3d, file_priv, &bin->base,
>  				   v3d_job_free, args->in_sync_bcl);
>  		if (ret) {
> -			kfree(bin);
>  			v3d_job_put(&render->base);
>  			kfree(bin);
>  			return ret;
> -- 
> 2.20.1
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch