From: Miles Chen
[ Upstream commit 33a1a7be198657c8ca26ad406c4d2a89b7162bcc ]
The issue is found by a fuzzing test.
If tty_find_polling_driver() recevies an incorrect input such as
',,' or '0b', the len becomes 0 and strncmp() always return 0.
In this case, a null p->ops->poll_init() is called
From: Miles Chen
[ Upstream commit 33a1a7be198657c8ca26ad406c4d2a89b7162bcc ]
The issue is found by a fuzzing test.
If tty_find_polling_driver() recevies an incorrect input such as
',,' or '0b', the len becomes 0 and strncmp() always return 0.
In this case, a null p->ops->poll_init() is called
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