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drm/meson: Fix invalid pointer in meson_drv_unbind() 

meson_drv_bind() registers a meson_drm struct as the device's privdata,
but meson_drv_unbind() tries to retrieve a drm_device. This may cause a
segfault on shutdown:

[ 5194.593429] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000197
 ...
[ 5194.788850] Call trace:
[ 5194.791349]  drm_dev_unregister+0x1c/0x118 [drm]
[ 5194.795848]  meson_drv_unbind+0x50/0x78 [meson_drm]

Retrieve the right pointer in meson_drv_unbind().

Fixes: bbbe775ec5 ("drm: Add support for Amlogic Meson Graphic Controller")
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Acked-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190322152657.13752-1-jean-philippe.brucker@arm.com
This commit is contained in:
Jean-Philippe Brucker 2019-03-22 15:26:56 +00:00 committed by Neil Armstrong
parent e9abc611a9
commit 776e78677f
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/meson/meson_drv.c
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@ -356,8 +356,8 @@ static int meson_drv_bind(struct device *dev)
static void meson_drv_unbind(struct device *dev)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct meson_drm *priv = drm->dev_private;
struct meson_drm *priv = dev_get_drvdata(dev);
struct drm_device *drm = priv->drm;
if (priv->canvas) {
meson_canvas_free(priv->canvas, priv->canvas_id_osd1);