CVE-2024-42090

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

pinctrl: fix deadlock in create_pinctrl() when handling -EPROBE_DEFER

In create_pinctrl(), pinctrl_maps_mutex is acquired before calling add_setting(). If add_setting() returns -EPROBE_DEFER, create_pinctrl() calls pinctrl_free(). However, pinctrl_free() attempts to acquire pinctrl_maps_mutex, which is already held by create_pinctrl(), leading to a potential deadlock.

This patch resolves the issue by releasing pinctrl_maps_mutex before calling pinctrl_free(), preventing the deadlock.

This bug was discovered and resolved using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc.

Weakness

The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.

Affected Software

Extended Description

Locking is a type of synchronization behavior that ensures that multiple independently-operating processes or threads do not interfere with each other when accessing the same resource. All processes/threads are expected to follow the same steps for locking. If these steps are not followed precisely - or if no locking is done at all - then another process/thread could modify the shared resource in a way that is not visible or predictable to the original process. This can lead to data or memory corruption, denial of service, etc.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/25.html
• https://cwe.mitre.org/data/definitions/26.html
• https://cwe.mitre.org/data/definitions/27.html

References

• https://git.kernel.org/stable/c/01fe2f885f7813f8aed5d3704b384a97b1116a9e
• https://git.kernel.org/stable/c/4038c57bf61631219b31f1bd6e92106ec7f084dc
• https://git.kernel.org/stable/c/420ce1261907e5dbeda1e4daffd5b6c76f8188c0
• https://git.kernel.org/stable/c/48a7a7c9571c3e62f17012dd7f2063e926179ddd
• https://git.kernel.org/stable/c/adec57ff8e66aee632f3dd1f93787c13d112b7a1
• https://git.kernel.org/stable/c/b36efd2e3e22a329444b6b24fa48df6d20ae66e6
• https://git.kernel.org/stable/c/b813e3fd102a959c5b208ed68afe27e0137a561b
• https://git.kernel.org/stable/c/e65a0dc2e85efb28e182aca50218e8a056d0ce04