Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: tty: serial: fsl_lpuart: fix race on RX DMA shutdown From time to time DMA completion can come in the middle of DMA shutdown: <process ctx>: <IRQ>: lpuart32_shutdown() lpuart_dma_shutdown() del_timer_sync() lpuart_dma_rx_complete() lpuart_copy_rx_to_tty() mod_timer() lpuart_dma_rx_free() When the timer fires a bit later, sport->dma_rx_desc is NULL: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004 pc : lpuart_copy_rx_to_tty+0xcc/0x5bc lr : lpuart_timer_func+0x1c/0x2c Call trace: lpuart_copy_rx_to_tty lpuart_timer_func call_timer_fn __run_timers.part.0 run_timer_softirq __do_softirq __irq_exit_rcu irq_exit handle_domain_irq gic_handle_irq call_on_irq_stack do_interrupt_handler ... To fix this fold del_timer_sync() into lpuart_dma_rx_free() after dmaengine_terminate_sync() to make sure timer will not be re-started in lpuart_copy_rx_to_tty() <= lpuart_dma_rx_complete().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4a8588a1cf867333187d9ff071e6fbdab587d194 before 19a98d56dfedafb25652bdb9cd48a4e73ceba702; affected 4a8588a1cf867333187d9ff071e6fbdab587d194 before 90530e7214c8a04dcdde57502d93fa96af288c38; affected 4a8588a1cf867333187d9ff071e6fbdab587d194 before 954fc9931f0aabf272b5674cf468affdd88d3a36; affected 4a8588a1cf867333187d9ff071e6fbdab587d194 before 2a36b444cace9580380467fd1183bb5e85bcc80a; affected 4a8588a1cf867333187d9ff071e6fbdab587d194 before 1be6f2b15f902c02e055ae0b419ca789200473c9; affected 5716a781032693d0f812ed06528d98195e9df028; affected 0d5cb6e8b4b62d8efd1a470615894276341d6db9; affected 3.18.9 before 3.19; affected 3.19.1 before 3.20 |
| Linux / Linux | affected 4.0; unaffected 0 before 4.0; unaffected 5.10.177 through 5.10.*; unaffected 5.15.105 through 5.15.*; unaffected 6.1.23 through 6.1.*; unaffected 6.2.8 through 6.2.*; unaffected 6.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/19a98d56dfedafb25652bdb9cd48a4e73ceba702
- https://git.kernel.org/stable/c/90530e7214c8a04dcdde57502d93fa96af288c38
- https://git.kernel.org/stable/c/954fc9931f0aabf272b5674cf468affdd88d3a36
- https://git.kernel.org/stable/c/2a36b444cace9580380467fd1183bb5e85bcc80a
- https://git.kernel.org/stable/c/1be6f2b15f902c02e055ae0b419ca789200473c9