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soc: qcom: ocmem: don't return NULL in of_get_ocmem 

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@onstation.org>
Fixes: 88c1e9404f ("soc: qcom: add OCMEM driver")
Signed-off-by: Luca Weiss <luca@z3ntu.xyz>
Link: https://lore.kernel.org/r/20210130142349.53335-1-luca@z3ntu.xyz
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Luca Weiss 2021-01-30 15:23:49 +01:00 committed by Bjorn Andersson
parent aec8535edc
commit 01f937ffc4
1 changed files with 7 additions and 1 deletions
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8
drivers/soc/qcom/ocmem.c
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@ -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);