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authorAlan Stern <stern@rowland.harvard.edu>2009-07-22 14:41:18 -0400
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 06:46:30 -0700
commit25118084ef03f4fc314ab33ef6a9d9271d0e616a (patch)
treeeb5be3e297ff1c3b12b555fb80d391f9706702f1 /drivers/usb/core/hub.c
parent81e5b23cd206d46d4872d25f3d7ff67a0f355c71 (diff)
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USB: check for hub driver not bound to root hub device
This patch (as1267) changes usb_kick_khubd() and hdev_to_hub() to make them more resilient against situations where a hub device isn't bound to the hub driver. The code assumes that if a root hub was successfully registered then it must be bound to the hub driver. But this assumption can fail if the user manually unbinds the hub driver, or more importantly, if the host controller dies causing usb_set_configuration to fail. To protect against these possibilities, make hdev_to_hub() check that the hub device is configured before dereferencing the active configuration, and make usb_kick_khubd() check that the pointer to the hub's private data structure isn't NULL. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/hub.c')
-rw-r--r--drivers/usb/core/hub.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 69e3a966a4b..645686a1421 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -163,8 +163,10 @@ static inline char *portspeed(int portstatus)
}
/* Note that hdev or one of its children must be locked! */
-static inline struct usb_hub *hdev_to_hub(struct usb_device *hdev)
+static struct usb_hub *hdev_to_hub(struct usb_device *hdev)
{
+ if (!hdev || !hdev->actconfig)
+ return NULL;
return usb_get_intfdata(hdev->actconfig->interface[0]);
}
@@ -385,8 +387,10 @@ static void kick_khubd(struct usb_hub *hub)
void usb_kick_khubd(struct usb_device *hdev)
{
- /* FIXME: What if hdev isn't bound to the hub driver? */
- kick_khubd(hdev_to_hub(hdev));
+ struct usb_hub *hub = hdev_to_hub(hdev);
+
+ if (hub)
+ kick_khubd(hub);
}