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usb: check usb_hub_to_struct_hub() return value 

usb_hub_to_struct_hub() can return NULL in some unlikely cases.
Add checks where appropriate, or pass the hub pointer as an additional
argument if it's known to be valid.

The places it makes sense to check usb_hub_to_struct_hub()
are picked based on feedback from Alan Stern.

Change-Id: I10103d23876934c7783e241f5a4a07587860822d
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 41341261aa1707b49f937ba2c20d1a0daa5afac3
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[mrana@codeaurora.org: resolve trivial merge conflicts]
CRs-Fixed: 562361
Signed-off-by: Mayank Rana <mrana@codeaurora.org>
This commit is contained in:
Mathias Nyman 2013-06-18 14:28:48 +00:00 committed by Mayank Rana
parent 76ccdc748c
commit e7f9878bef
3 changed files with 19 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
drivers/usb/core/hub.c
View File

@ -718,18 +718,18 @@ static void hub_tt_work(struct work_struct *work)
/**
* usb_hub_set_port_power - control hub port's power state
* @hdev: target hub
* @hdev: USB device belonging to the usb hub
* @hub: target hub
* @port1: port index
* @set: expected status
*
* call this function to control port's power via setting or
* clearing the port's PORT_POWER feature.
*/
int usb_hub_set_port_power(struct usb_device *hdev, int port1,
bool set)
int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
int port1, bool set)
{
int ret;
struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
struct usb_port *port_dev = hub->ports[port1 - 1];
if (set)
@ -1779,15 +1779,17 @@ hub_ioctl(struct usb_interface *intf, unsigned int code, void *user_data)
static int find_port_owner(struct usb_device *hdev, unsigned port1,
struct dev_state ***ppowner)
{
struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
if (hdev->state == USB_STATE_NOTATTACHED)
return -ENODEV;
if (port1 == 0 || port1 > hdev->maxchild)
return -EINVAL;
/* This assumes that devices not managed by the hub driver
/* Devices not managed by the hub driver
* will always have maxchild equal to 0.
*/
*ppowner = &(usb_hub_to_struct_hub(hdev)->ports[port1 - 1]->port_owner);
*ppowner = &(hub->ports[port1 - 1]->port_owner);
return 0;
}
@ -5416,7 +5418,8 @@ void usb_set_hub_port_connect_type(struct usb_device *hdev, int port1,
{
struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
hub->ports[port1 - 1]->connect_type = type;
if (hub)
hub->ports[port1 - 1]->connect_type = type;
}
/**
@ -5432,6 +5435,9 @@ usb_get_hub_port_connect_type(struct usb_device *hdev, int port1)
{
struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
if (!hub)
return USB_PORT_CONNECT_TYPE_UNKNOWN;
return hub->ports[port1 - 1]->connect_type;
}
@ -5490,6 +5496,9 @@ acpi_handle usb_get_hub_port_acpi_handle(struct usb_device *hdev,
{
struct usb_hub *hub = usb_hub_to_struct_hub(hdev);
if (!hub)
return NULL;
return DEVICE_ACPI_HANDLE(&hub->ports[port1 - 1]->dev);
}
#endif

2
drivers/usb/core/hub.h
View File

@ -100,7 +100,7 @@ extern int usb_hub_create_port_device(struct usb_hub *hub,
int port1);
extern void usb_hub_remove_port_device(struct usb_hub *hub,
int port1);
extern int usb_hub_set_port_power(struct usb_device *hdev,
extern int usb_hub_set_port_power(struct usb_device *hdev, struct usb_hub *hub,
int port1, bool set);
extern struct usb_hub *usb_hub_to_struct_hub(struct usb_device *hdev);
extern int hub_port_debounce(struct usb_hub *hub, int port1,

4
drivers/usb/core/port.c
View File

@ -86,7 +86,7 @@ static int usb_port_runtime_resume(struct device *dev)
usb_autopm_get_interface(intf);
set_bit(port1, hub->busy_bits);
retval = usb_hub_set_port_power(hdev, port1, true);
retval = usb_hub_set_port_power(hdev, hub, port1, true);
if (port_dev->child && !retval) {
/*
* Wait for usb hub port to be reconnected in order to make
@ -128,7 +128,7 @@ static int usb_port_runtime_suspend(struct device *dev)
usb_autopm_get_interface(intf);
set_bit(port1, hub->busy_bits);
retval = usb_hub_set_port_power(hdev, port1, false);
retval = usb_hub_set_port_power(hdev, hub, port1, false);
usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_CONNECTION);
usb_clear_port_feature(hdev, port1, USB_PORT_FEAT_C_ENABLE);
clear_bit(port1, hub->busy_bits);