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Vulnerability CVE-2024-41088
Published: 2024-07-29
| Description: |
In the Linux kernel, the following vulnerability has been resolved:
can: mcp251xfd: fix infinite loop when xmit fails
When the mcp251xfd_start_xmit() function fails, the driver stops
processing messages, and the interrupt routine does not return,
running indefinitely even after killing the running application.
Error messages:
[ 441.298819] mcp251xfd spi2.0 can0: ERROR in mcp251xfd_start_xmit: -16
[ 441.306498] mcp251xfd spi2.0 can0: Transmit Event FIFO buffer not empty. (seq=0x000017c7, tef_tail=0x000017cf, tef_head=0x000017d0, tx_head=0x000017d3).
... and repeat forever.
The issue can be triggered when multiple devices share the same SPI
interface. And there is concurrent access to the bus.
The problem occurs because tx_ring->head increments even if
mcp251xfd_start_xmit() fails. Consequently, the driver skips one TX
package while still expecting a response in
mcp251xfd_handle_tefif_one().
Resolve the issue by starting a workqueue to write the tx obj
synchronously if err = -EBUSY. In case of another error, decrement
tx_ring->head, remove skb from the echo stack, and drop the message.
[mkl: use more imperative wording in patch description] |
References: |
https://git.kernel.org/stable/c/f926c022ebaabf7963bebf89a97201d66978a025
https://git.kernel.org/stable/c/3e72558c1711d524e3150103739ddd06650e291b
https://git.kernel.org/stable/c/6c6b4afa59c2fb4d1759235f866d8caed2aa4729
https://git.kernel.org/stable/c/d8fb63e46c884c898a38f061c2330f7729e75510
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