USB: serial: io_ti: fix NULL-deref in interrupt callback
commit
0b1d250afb8eb9d65afb568bac9b9f9253a82b49 upstream.
Fix a NULL-pointer dereference in the interrupt callback should a
malicious device send data containing a bad port number by adding the
missing sanity check.
Fixes:
1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
[bwh: Backported to 3.2:
- Use &urb->dev->dev instead of local dev variable
- Adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>