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usb: roles: Fix potential NULL dereference in intel_xhci_usb_probe() 

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(pdev, t, n);
+ if (!res)
+   return -EINVAL;
... when != res == NULL
e = devm_ioremap_nocache(e1, res->start, e2);

Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wei Yongjun 2018-03-29 02:14:11 +00:00 committed by Greg Kroah-Hartman
parent 03eb4c3314
commit 548f4726a1
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/roles/intel-xhci-usb-role-switch.c
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@ -144,6 +144,8 @@ static int intel_xhci_usb_probe(struct platform_device *pdev)
return -ENOMEM; return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
data->base = devm_ioremap_nocache(dev, res->start, resource_size(res)); data->base = devm_ioremap_nocache(dev, res->start, resource_size(res));
if (!data->base) if (!data->base)
return -ENOMEM; return -ENOMEM;