[PATCH] USB: usbserial: Adds missing checks and bug fix.
Checks if 'port' is NULL before using it in all tty operations, this can avoid NULL pointer dereferences. Signed-off-by: NLuiz Capitulino <lcapitulino@mandriva.com.br> Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>
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