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authorSergey Temerkhanov <s.temerkhanov@gmail.com>2015-08-17 15:38:07 +0300
committerMarek Vasut <marex@denx.de>2015-08-19 22:30:20 +0200
commita5ccda47f1587180b70c634ba4cb7f8d151f408a (patch)
tree5e2f25727039cf35067eadb8f7834e5dfb017240 /drivers
parente8d056989a7302eda4e3ed263a375fd175a4e15f (diff)
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usb: xhci: Fix a potential NULL pointer dereference
This patch fixes a potential NULL pointer dereference arising on non-present/non-initialized xHCI controllers and adds some error handling to xHCI code Signed-off-by: Sergey Temerkhanov <s.temerkhanov@gmail.com> Signed-off-by: Radha Mohan Chintakuntla <rchintakuntla@cavium.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/usb/host/xhci.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 0b09643..307e1a6 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -199,7 +199,7 @@ int xhci_reset(struct xhci_hcor *hcor)
int ret;
/* Halting the Host first */
- debug("// Halt the HC\n");
+ debug("// Halt the HC: %p\n", hcor);
state = xhci_readl(&hcor->or_usbsts) & STS_HALT;
if (!state) {
cmd = xhci_readl(&hcor->or_usbcmd);
@@ -1064,6 +1064,8 @@ int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
struct xhci_ctrl *ctrl;
int ret;
+ *controller = NULL;
+
if (xhci_hcd_init(index, &hccr, (struct xhci_hcor **)&hcor) != 0)
return -ENODEV;
@@ -1077,7 +1079,12 @@ int usb_lowlevel_init(int index, enum usb_init_type init, void **controller)
ret = xhci_lowlevel_init(ctrl);
- *controller = &xhcic[index];
+ if (ret) {
+ ctrl->hccr = NULL;
+ ctrl->hcor = NULL;
+ } else {
+ *controller = &xhcic[index];
+ }
return ret;
}
@@ -1093,9 +1100,11 @@ int usb_lowlevel_stop(int index)
{
struct xhci_ctrl *ctrl = (xhcic + index);
- xhci_lowlevel_stop(ctrl);
- xhci_hcd_stop(index);
- xhci_cleanup(ctrl);
+ if (ctrl->hcor) {
+ xhci_lowlevel_stop(ctrl);
+ xhci_hcd_stop(index);
+ xhci_cleanup(ctrl);
+ }
return 0;
}