From: José Expósito jose.exposito89@gmail.com

stable inclusion from stable-v4.19.228 commit ca63eeb70fcb53c42e1fe54e1735a54d8e7759fd category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IA72C3 CVE: CVE-2022-48756

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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commit 5e761a2287234bc402ba7ef07129f5103bcd775c upstream.

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@gmail.com Reviewed-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Link: https://lore.kernel.org/r/20220116181844.7400-1-jose.exposito89@gmail.com Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Pu Lehui pulehui@huawei.com --- drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c index 9a9fa0c75a13..fa0e33ca91ca 100644 --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c @@ -667,12 +667,14 @@ 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",