4.20-stable review patch. If anyone has any objections, please let me know.
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From: Enric Balletbo i Serra enric.balletbo@collabora.com
commit 4eda776c3cefcb1f01b2d85bd8753f67606282b5 upstream.
'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: 5182c1a556d7f ("drm/rockchip: add an common abstracted PSR driver") Cc: stable@vger.kernel.org Signed-off-by: Enric Balletbo i Serra enric.balletbo@collabora.com Signed-off-by: Heiko Stuebner heiko@sntech.de Link: https://patchwork.freedesktop.org/patch/msgid/20181013105654.11827-1-enric.b... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c @@ -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;