CVE-2026-23357

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

can: mcp251x: fix deadlock in error path of mcp251x_open

The mcp251x_open() function call free_irq() in its error path with the

mpc_lock mutex held. But if an interrupt already occurred the

interrupt handler will be waiting for the mpc_lock and free_irq() will

deadlock waiting for the handler to finish.

This issue is similar to the one fixed in commit 7dd9c26bd6cf ("can:

mcp251x: fix deadlock if an interrupt occurs during mcp251x_open") but

for the error path.

To solve this issue move the call to free_irq() after the lock is

released. Setting `priv->force_quit = 1` beforehand ensure that the IRQ

handler will exit right away once it acquired the lock.