Improper Locking Affecting dlm-kmp-default package, versions <6.4.0-150600.23.25.1

Note: Versions mentioned in the description apply only to the upstream dlm-kmp-default package and not the dlm-kmp-default package as distributed by SLES. See How to fix? for SLES:15.6 relevant fixed versions and status.

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() <interrupt> 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.

• https://www.suse.com/security/cve/CVE-2024-46791.html
• https://bugzilla.suse.com/1230821
• https://git.kernel.org/stable/c/3a49b6b1caf5cefc05264d29079d52c99cb188e0
• https://git.kernel.org/stable/c/513c8fc189b52f7922e36bdca58997482b198f0e
• https://git.kernel.org/stable/c/7dd9c26bd6cf679bcfdef01a8659791aa6487a29
• https://git.kernel.org/stable/c/8fecde9c3f9a4b97b68bb97c9f47e5b662586ba7
• https://git.kernel.org/stable/c/e554113a1cd2a9cfc6c7af7bdea2141c5757e188
• https://git.kernel.org/stable/c/f7ab9e14b23a3eac6714bdc4dba244d8aa1ef646