kernel: serial: imx: Introduce timeout when waiting on transmitter empty

A vulnerability was found in the Linux kernel's imx serial driver, where the system could experience DoS while waiting for the transmitter to become empty, without a timeout mechanism, the code risks entering a deadlock situation if the USR2TXDC signal is not set...

DEBIAN-CVE-2024-40967

In the Linux kernel, the following vulnerability has been resolved: serial: imx: Introduce timeout when waiting on transmitter empty By waiting at most 1 second for USR2TXDC to be set, we avoid a potential deadlock. In case of the timeout, there is not much we can do, so we simply ignore the...