This is a note to let you know that I've just added the patch titled
drm/msm/dsi: invalid parameter check in msm_dsi_phy_enable
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-msm-dsi-invalid-parameter-check-in-msm_dsi_phy_e.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 7b19d8c30563ea4b7af9f195dda8ef20d2d2db65
Author: José Expósito <jose.exposito89@xxxxxxxxx>
Date: Sun Jan 16 19:18:44 2022 +0100
drm/msm/dsi: invalid parameter check in msm_dsi_phy_enable
[ Upstream commit 5e761a2287234bc402ba7ef07129f5103bcd775c ]
The function performs a check on the "phy" input parameter, however, it
is used before the check.
Initialize the "dev" variable after the sanity check to avoid a possible
NULL pointer dereference.
Fixes: 5c8290284402b ("drm/msm/dsi: Split PHY drivers to separate files")
Addresses-Coverity-ID: 1493860 ("Null pointer dereference")
Signed-off-by: José Expósito <jose.exposito89@xxxxxxxxx>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220116181844.7400-1-jose.exposito89@xxxxxxxxx
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
index c0a7fa56d9a74..32c7bf0d44faf 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
@@ -554,12 +554,14 @@ void __exit msm_dsi_phy_driver_unregister(void)
int msm_dsi_phy_enable(struct msm_dsi_phy *phy, int src_pll_id,
struct msm_dsi_phy_clk_request *clk_req)
{
- struct device *dev = &phy->pdev->dev;
+ struct device *dev;
int ret;
if (!phy || !phy->cfg->ops.enable)
return -EINVAL;
+ dev = &phy->pdev->dev;
+
ret = dsi_phy_enable_resource(phy);
if (ret) {
dev_err(dev, "%s: resource enable failed, %d\n",
