CVE-2023-52456

In the Linux kernel, the following vulnerability has been resolved:

serial: imx: fix tx statemachine deadlock

When using the serial port as RS485 port, the tx statemachine is used to control the RTS pin to drive the RS485 transceiver TXEN pin. When the TTY port is closed in the middle of a transmission (for instance during userland application crash), imxuartshutdown disables the interface and disables the Transmission Complete interrupt. afer that, imxuartstoptx bails on an incomplete transmission, to be retriggered by the TC interrupt. This interrupt is disabled and therefore the tx statemachine never transitions out of SEND. The statemachine is in deadlock now, and the TX_EN remains low, making the interface useless.

imxuartstoptx now checks for incomplete transmission AND whether TC interrupts are enabled before bailing to be retriggered. This makes sure the state machine handling is reached, and is properly set to WAITAFTER_SEND.