Description
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 TX_EN pin. When the TTY port is closed in the middle of a transmission (for instance during userland application crash), imx_uart_shutdown disables the interface and disables the Transmission Complete interrupt. afer that, imx_uart_stop_tx 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. imx_uart_stop_tx 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 WAIT_AFTER_SEND.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
cb1a609236096c278ecbfb7be678a693a70283f1 to < 6e04a9d30509fb53ba6df5d655ed61d607a7cfdaaffectedcb1a609236096c278ecbfb7be678a693a70283f1 to < ff168d4fdb0e1ba35fb413a749b3d6cce918ec19affectedcb1a609236096c278ecbfb7be678a693a70283f1 to < 63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06affectedcb1a609236096c278ecbfb7be678a693a70283f1 to < 763cd68746317b5d746dc2649a3295c1efb41181affectedcb1a609236096c278ecbfb7be678a693a70283f1 to < 9a662d06c22ddfa371958c2071dc350436be802baffectedcb1a609236096c278ecbfb7be678a693a70283f1 to < 78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0affected
Linux Linux
Default version status: affected
5.9affected0 to < 5.9unaffected5.10.209 to ≤ 5.10.*unaffected5.15.148 to ≤ 5.15.*unaffected6.1.75 to ≤ 6.1.*unaffected6.6.14 to ≤ 6.6.*unaffected6.7.2 to ≤ 6.7.*unaffected6.8 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/6e04a9d30509fb53ba6df5d655ed61d607a7cfda ↗
- https://git.kernel.org/stable/c/ff168d4fdb0e1ba35fb413a749b3d6cce918ec19 ↗
- https://git.kernel.org/stable/c/63ee7be01a3f7d28b1ea8b8d7944f12bb7b0ed06 ↗
- https://git.kernel.org/stable/c/763cd68746317b5d746dc2649a3295c1efb41181 ↗
- https://git.kernel.org/stable/c/9a662d06c22ddfa371958c2071dc350436be802b ↗
- https://git.kernel.org/stable/c/78d60dae9a0c9f09aa3d6477c94047df2fe6f7b0 ↗
- https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html ↗