platform_get_resource_byname() may fail and in this case a NULL
dereference will occur.
Fix it to use devm_platform_ioremap_resource_byname() instead of calling
platform_get_resource_byname() and devm_ioremap().
This is detected by Coccinelle semantic patch.
@@
expression pdev, res, n, t, e, e1, e2;
@@
res = \(platform_get_resource\|platform_get_resource_byname\)(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: Zhang Changzhong <zhangchangzhong@huawei.com>
Link: https://lore.kernel.org/r/1607392473-20610-1-git-send-email-zhangchangzhong@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
static void qcom_slim_prg_slew(struct platform_device *pdev,
struct qcom_slim_ctrl *ctrl)
{
- struct resource *slew_mem;
-
if (!ctrl->slew_reg) {
/* SLEW RATE register for this SLIMbus */
- slew_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
- "slew");
- ctrl->slew_reg = devm_ioremap(&pdev->dev, slew_mem->start,
- resource_size(slew_mem));
- if (!ctrl->slew_reg)
+ ctrl->slew_reg = devm_platform_ioremap_resource_byname(pdev, "slew");
+ if (IS_ERR(ctrl->slew_reg))
return;
}