linux-kernel - Re: [PATCH] drm/qxl: fix a memory leak bug

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Date:   Tue, 20 Aug 2019 08:57:24 +0200
From:   Gerd Hoffmann <kraxel@...hat.com>
To:     Wenwen Wang <wenwen@...uga.edu>
Cc:     Dave Airlie <airlied@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        "open list:DRM DRIVER FOR QXL VIRTUAL GPU" 
        <virtualization@...ts.linux-foundation.org>,
        "open list:DRM DRIVER FOR QXL VIRTUAL GPU" 
        <spice-devel@...ts.freedesktop.org>,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/qxl: fix a memory leak bug

On Mon, Aug 19, 2019 at 01:08:18PM -0500, Wenwen Wang wrote:
> In qxl_bo_create(), the temporary 'bo' is allocated through kzalloc().
> However, it is not deallocated in the following execution if ttm_bo_init()
> fails, leading to a memory leak bug. To fix this issue, free 'bo' before
> returning the error.

No.  ttm_bo_init() calls the destroy callback (qxl_ttm_bo_destroy for
qxl) on failure, which will properly cleanup 'bo' and also free it.

cheers,
  Gerd