USB: serial: kobil_sct: fix NULL-deref in write
commit
21ce57840243c7b70fbc1ebd3dceeb70bb6e9e09 upstream.
Fix NULL-pointer dereference in write() should the device lack the
expected interrupt-out endpoint:
Unable to handle kernel NULL pointer dereference at virtual address
00000054
...
PC is at kobil_write+0x144/0x2a0 [kobil_sct]
Fixes:
1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2: add this check to the existing
usb_serial_driver::attach implementation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>