platform_get_resource() may fail and return NULL, so we should better check it's return value to avoid a NULL pointer dereference a bit later in the code.
This is detected by Coccinelle semantic patch.
@@ expression pdev, res, n, t, e, e1, e2; @@
res = platform_get_resource_byname(pdev, t, n); + if (!res) + return -EINVAL; ... when != res == NULL e = devm_ioremap(e1, res->start, e2);
Fixes: ad7fcbc308b0 ("slimbus: qcom: Add Qualcomm Slimbus controller driver") Signed-off-by: Wei Yongjun weiyongjun1@huawei.com --- drivers/slimbus/qcom-ctrl.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/slimbus/qcom-ctrl.c b/drivers/slimbus/qcom-ctrl.c index bb36a8f..caea3b9 100644 --- a/drivers/slimbus/qcom-ctrl.c +++ b/drivers/slimbus/qcom-ctrl.c @@ -478,6 +478,8 @@ static void qcom_slim_prg_slew(struct platform_device *pdev, /* SLEW RATE register for this SLIMbus */ slew_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "slew"); + if (!slew_mem) + return; ctrl->slew_reg = devm_ioremap(&pdev->dev, slew_mem->start, resource_size(slew_mem)); if (!ctrl->slew_reg)