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| author | Alan Stern <stern@rowland.harvard.edu> | 2010-09-21 15:01:53 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-09-24 11:05:00 -0700 |
| commit | 0026e00523a85b90a92a93ddf6660939ecef3e54 (patch) | |
| tree | d618b4eb0948c061256346410a4107a526aaab40 /drivers/usb/core/message.c | |
| parent | a850ea30374ebed32a0724742601861853fde869 (diff) | |
| download | linux-0026e00523a85b90a92a93ddf6660939ecef3e54.tar.gz linux-0026e00523a85b90a92a93ddf6660939ecef3e54.tar.bz2 linux-0026e00523a85b90a92a93ddf6660939ecef3e54.zip | |
USB: fix bug in initialization of interface minor numbers
Recent changes in the usbhid layer exposed a bug in usbcore. If
CONFIG_USB_DYNAMIC_MINORS is enabled then an interface may be assigned
a minor number of 0. However interfaces that aren't registered as USB
class devices also have their minor number set to 0, during
initialization. As a result usb_find_interface() may return the
wrong interface, leading to a crash.
This patch (as1418) fixes the problem by initializing every
interface's minor number to -1. It also cleans up the
usb_register_dev() function, which besides being somewhat awkwardly
written, does not unwind completely on all its error paths.
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Philip J. Turmel <philip@turmel.org>
Tested-by: Gabriel Craciunescu <nix.or.die@googlemail.com>
Tested-by: Alex Riesen <raa.lkml@gmail.com>
Tested-by: Matthias Bayer <jackdachef@gmail.com>
CC: Jiri Kosina <jkosina@suse.cz>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/core/message.c')
| -rw-r--r-- | drivers/usb/core/message.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c index 844683e50383..9f0ce7de0e36 100644 --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -1802,6 +1802,7 @@ free_interfaces: intf->dev.groups = usb_interface_groups; intf->dev.dma_mask = dev->dev.dma_mask; INIT_WORK(&intf->reset_ws, __usb_queue_reset_device); + intf->minor = -1; device_initialize(&intf->dev); dev_set_name(&intf->dev, "%d-%s:%d.%d", dev->bus->busnum, dev->devpath, |