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USB: omninet: fix potential tty NULL dereference
authorAlexey Khoroshilov <khoroshilov@ispras.ru>
Thu, 13 Sep 2012 18:56:55 +0000 (22:56 +0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 14 Sep 2012 04:48:48 +0000 (21:48 -0700)
Add check for return value of tty_port_tty_get,
since it can return NULL after port hangup that may happen anytime.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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