CVE-2024-46791 - Linux MCP251X Interrupt Handler Deadlock in Mutex Acquisition

CVE-2024-46791 - Linux MCP251X Interrupt Handler Deadlock in Mutex Acquisition

https://cvefeed.io/rssfeed/latest.atom / Wed, 09/18/2024 - 14:39
CVE ID : CVE-2024-46791
Published : Sept. 18, 2024, 8:15 a.m. | 4 hours, 27 minutes ago
Description : In the Linux kernel, the following vulnerability has been resolved: can: mcp251x: fix deadlock if an interrupt occurs during mcp251x_open The mcp251x_hw_wake() function is called with the mpc_lock mutex held and disables the interrupt handler so that no interrupts can be processed while waking the device. If an interrupt has already occurred then waiting for the interrupt handler to complete will deadlock because it will be trying to acquire the same mutex. CPU0 CPU1 ---- ---- mcp251x_open() mutex_lock(&priv->mcp_lock) request_threaded_irq() mcp251x_can_ist() mutex_lock(&priv->mcp_lock) mcp251x_hw_wake() disable_irq() <-- deadlock Use disable_irq_nosync() instead because the interrupt handler does everything while holding the mutex so it doesn't matter if it's still running.
Severity: 0.0 | NA
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