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| author | Enric Balletbo i Serra <enric.balletbo@collabora.com> | 2018-10-13 12:56:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-05-16 19:42:29 +0200 |
| commit | 34572dadff451568b2db16e9765b0d32b3430514 (patch) | |
| tree | a790fe9dc7d46ec02cf49adfc77158d3fd1ebe7a | |
| parent | 041ef4231cae4ed533c0a050b0b60629ac9b02da (diff) | |
| download | linux-stable-34572dadff451568b2db16e9765b0d32b3430514.tar.gz linux-stable-34572dadff451568b2db16e9765b0d32b3430514.tar.bz2 linux-stable-34572dadff451568b2db16e9765b0d32b3430514.zip | |
drm/rockchip: psr: do not dereference encoder before it is null checked.
[ Upstream commit 4eda776c3cefcb1f01b2d85bd8753f67606282b5 ]
'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.balletbo@collabora.com
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
| -rw-r--r-- | drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c index a553e182ff53..32e7dba2bf5e 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c @@ -221,13 +221,15 @@ EXPORT_SYMBOL(rockchip_drm_psr_flush_all); int rockchip_drm_psr_register(struct drm_encoder *encoder, void (*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; unsigned long flags; if (!encoder || !psr_set) return -EINVAL; + drm_drv = encoder->dev->dev_private; + psr = kzalloc(sizeof(struct psr_drv), GFP_KERNEL); if (!psr) return -ENOMEM; |