| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 21/44] drm/msm: Fix null pointer dereference on pointer edp | Date | Mon, 25 Oct 2021 21:14:02 +0200 |
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From: Colin Ian King <colin.king@canonical.com>
commit 2133c4fc8e1348dcb752f267a143fe2254613b34 upstream.
The initialization of pointer dev dereferences pointer edp before edp is null checked, so there is a potential null pointer deference issue. Fix this by only dereferencing edp after edp has been null checked.
Addresses-Coverity: ("Dereference before null check") Fixes: ab5b0107ccf3 ("drm/msm: Initial add eDP support in msm drm driver (v5)") Signed-off-by: Colin Ian King <colin.king@canonical.com> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Link: https://lore.kernel.org/r/20210929121857.213922-1-colin.king@canonical.com Signed-off-by: Rob Clark <robdclark@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/gpu/drm/msm/edp/edp_ctrl.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/msm/edp/edp_ctrl.c +++ b/drivers/gpu/drm/msm/edp/edp_ctrl.c @@ -1095,7 +1095,7 @@ void msm_edp_ctrl_power(struct edp_ctrl int msm_edp_ctrl_init(struct msm_edp *edp) { struct edp_ctrl *ctrl = NULL; - struct device *dev = &edp->pdev->dev; + struct device *dev; int ret; if (!edp) { @@ -1103,6 +1103,7 @@ int msm_edp_ctrl_init(struct msm_edp *ed return -EINVAL; } + dev = &edp->pdev->dev; ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL); if (!ctrl) return -ENOMEM;
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