Commit 4eda776c authored by Enric Balletbo i Serra's avatar Enric Balletbo i Serra Committed by Heiko Stuebner

drm/rockchip: psr: do not dereference encoder before it is null checked.

'encoder' is dereferenced before it is null sanity checked, hence we
potentially have a null pointer dereference bug. Instead, initialise
drm_drv from encoder->dev->dev_private after we are sure 'encoder' is
not null.

Fixes: 5182c1a5 ("drm/rockchip: add an common abstracted PSR driver")
Cc: stable@vger.kernel.org
Signed-off-by: default avatarEnric Balletbo i Serra <enric.balletbo@collabora.com>
Signed-off-by: default avatarHeiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20181013105654.11827-1-enric.balletbo@collabora.com
parent 649fdce2
......@@ -189,12 +189,14 @@ EXPORT_SYMBOL(rockchip_drm_psr_flush_all);
int rockchip_drm_psr_register(struct drm_encoder *encoder,
int (*psr_set)(struct drm_encoder *, bool enable))
{
struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;
struct rockchip_drm_private *drm_drv;
struct psr_drv *psr;
if (!encoder || !psr_set)
return -EINVAL;
drm_drv = encoder->dev->dev_private;
psr = kzalloc(sizeof(struct psr_drv), GFP_KERNEL);
if (!psr)
return -ENOMEM;
......
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