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

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Date:   Thu, 24 Oct 2019 13:43:38 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Eric Anholt <eric@...olt.net>, David Airlie <airlied@...ux.ie>,
        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 24/10/2019 13:38, Daniel Vetter wrote:
> 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

linux-next

Colin
> 
>> ---
>>  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
>>
>