CVE-2021-47437

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

iio: adis16475: fix deadlock on frequency set

With commit 39c024b51b560 (iio: adis16475: improve sync scale mode handling), two deadlocks were introduced:

1. The call to adis_write_reg_16() was not changed to its unlocked version.
2. The lock was not being released on the success path of the function.

This change fixes both these issues.

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/04e03b907022ebd876f422f17efcc2c6cc934dc6
• https://git.kernel.org/stable/c/9da1b86865ab4376408c58cd9fec332c8bdb5c73
• https://git.kernel.org/stable/c/04e03b907022ebd876f422f17efcc2c6cc934dc6
• https://git.kernel.org/stable/c/9da1b86865ab4376408c58cd9fec332c8bdb5c73