From: Luca Weiss <luca@xxxxxxxxx>
[ Upstream commit 01f937ffc4686837d6c43dea80c6ade6cbd2940a ]
If ocmem probe fails for whatever reason, of_get_ocmem returned NULL.
Without this, users must check for both NULL and IS_ERR on the returned
pointer - which didn't happen in drivers/gpu/drm/msm/adreno/adreno_gpu.c
leading to a NULL pointer dereference.
Reviewed-by: Brian Masney <masneyb@xxxxxxxxxxxxx>
Fixes: 88c1e9404f1d ("soc: qcom: add OCMEM driver")
Signed-off-by: Luca Weiss <luca@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210130142349.53335-1-luca@xxxxxxxxx
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/soc/qcom/ocmem.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/soc/qcom/ocmem.c b/drivers/soc/qcom/ocmem.c
index 7f9e9944d1eae..f1875dc31ae2c 100644
--- a/drivers/soc/qcom/ocmem.c
+++ b/drivers/soc/qcom/ocmem.c
@@ -189,6 +189,7 @@ struct ocmem *of_get_ocmem(struct device *dev)
{
struct platform_device *pdev;
struct device_node *devnode;
+ struct ocmem *ocmem;
devnode = of_parse_phandle(dev->of_node, "sram", 0);
if (!devnode || !devnode->parent) {
@@ -202,7 +203,12 @@ struct ocmem *of_get_ocmem(struct device *dev)
return ERR_PTR(-EPROBE_DEFER);
}
- return platform_get_drvdata(pdev);
+ ocmem = platform_get_drvdata(pdev);
+ if (!ocmem) {
+ dev_err(dev, "Cannot get ocmem\n");
+ return ERR_PTR(-ENODEV);
+ }
+ return ocmem;
}
EXPORT_SYMBOL(of_get_ocmem);
--
2.27.0
