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authorHorst Schirmeier <horst@schirmeier.com>2006-03-09 14:10:49 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2006-03-20 14:50:01 -0800
commitf48219db93eaee644e9fd9f22fb6421f38059cc5 (patch)
treedf29efdc95c79a57ff31b7d768c739da0e8ba6bc /drivers/usb/core
parent6aa35675bbc370e5f11baae7e01a9ab255d8030c (diff)
[PATCH] USB: usbcore: usb_set_configuration oops (NULL ptr dereference)
When trying to deconfigure a device via usb_set_configuration(dev, 0), 2.6.16-rc kernels after 55c527187c9d78f840b284d596a0b298bc1493af oops with "Unable to handle NULL pointer dereference at...". This is due to an unchecked dereference of cp in the power budget part. Signed-off-by: Horst Schirmeier <horst@schirmeier.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core')
-rw-r--r--drivers/usb/core/message.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 2f6009b0cff..08fb20f06f3 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -1388,11 +1388,13 @@ free_interfaces:
if (dev->state != USB_STATE_ADDRESS)
usb_disable_device (dev, 1); // Skip ep0
- i = dev->bus_mA - cp->desc.bMaxPower * 2;
- if (i < 0)
- dev_warn(&dev->dev, "new config #%d exceeds power "
- "limit by %dmA\n",
- configuration, -i);
+ if (cp) {
+ i = dev->bus_mA - cp->desc.bMaxPower * 2;
+ if (i < 0)
+ dev_warn(&dev->dev, "new config #%d exceeds power "
+ "limit by %dmA\n",
+ configuration, -i);
+ }
if ((ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_CONFIGURATION, 0, configuration, 0,