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() <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.
Product status
8ce8c0abcba314e1fe954a1840f6568bf5aef2ef (git) before 3a49b6b1caf5cefc05264d29079d52c99cb188e0
8ce8c0abcba314e1fe954a1840f6568bf5aef2ef (git) before 513c8fc189b52f7922e36bdca58997482b198f0e
8ce8c0abcba314e1fe954a1840f6568bf5aef2ef (git) before f7ab9e14b23a3eac6714bdc4dba244d8aa1ef646
8ce8c0abcba314e1fe954a1840f6568bf5aef2ef (git) before 8fecde9c3f9a4b97b68bb97c9f47e5b662586ba7
8ce8c0abcba314e1fe954a1840f6568bf5aef2ef (git) before e554113a1cd2a9cfc6c7af7bdea2141c5757e188
8ce8c0abcba314e1fe954a1840f6568bf5aef2ef (git) before 7dd9c26bd6cf679bcfdef01a8659791aa6487a29
5.5
Any version before 5.5
5.10.226 (semver)
5.15.167 (semver)
6.1.110 (semver)
6.6.51 (semver)
6.10.10 (semver)
6.11 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/01/msg00001.html
lists.debian.org/debian-lts-announce/2024/10/msg00003.html
git.kernel.org/...c/3a49b6b1caf5cefc05264d29079d52c99cb188e0
git.kernel.org/...c/513c8fc189b52f7922e36bdca58997482b198f0e
git.kernel.org/...c/f7ab9e14b23a3eac6714bdc4dba244d8aa1ef646
git.kernel.org/...c/8fecde9c3f9a4b97b68bb97c9f47e5b662586ba7
git.kernel.org/...c/e554113a1cd2a9cfc6c7af7bdea2141c5757e188
git.kernel.org/...c/7dd9c26bd6cf679bcfdef01a8659791aa6487a29
