linux-kernel - Re: [PATCH] drm/vmwgfx: fix memory leak when too many retries have occurred

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Message-ID: <82a6382b-6c9d-5c7f-b411-243cb31b2c16@canonical.com>
Date:   Mon, 24 Jun 2019 17:13:34 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Deepak Singh Rawat <drawat@...are.com>,
        Linux-graphics-maintainer <Linux-graphics-maintainer@...are.com>,
        Thomas Hellstrom <thellstrom@...are.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Cc:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/vmwgfx: fix memory leak when too many retries have
 occurred

On 24/06/2019 17:10, Deepak Singh Rawat wrote:
> Hi Colin,
> 
> Thanks for doing this.
> 
> Reviewed-by: Deepak Rawat <drawat@...are.com>
> 
> Do you want me to include this in vmwgfx-next or will you submit this
> via drm-mics?

Can you include it into vmwgfx-next?

Thanks

Colin

> 
> On Fri, 2019-06-21 at 23:35 +0100, Colin King wrote:
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> Currently when too many retries have occurred there is a memory
>> leak on the allocation for reply on the error return path. Fix
>> this by kfree'ing reply before returning.
>>
>> Addresses-Coverity: ("Resource leak")
>> Fixes: a9cd9c044aa9 ("drm/vmwgfx: Add a check to handle host message
>> failure")
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/gpu/drm/vmwgfx/vmwgfx_msg.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
>> b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
>> index 8b9270f31409..8b61f16f50cf 100644
>> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
>> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_msg.c
>> @@ -301,8 +301,10 @@ static int vmw_recv_msg(struct rpc_channel
>> *channel, void **msg,
>>  		break;
>>  	}
>>  
>> -	if (retries == RETRIES)
>> +	if (retries == RETRIES) {
>> +		kfree(reply);
>>  		return -EINVAL;
>> +	}
>>  
>>  	*msg_len = reply_len;
>>  	*msg     = reply;
>