Detections
Analytics
CVE-2021-47195
medium
Description
In the Linux kernel, the following vulnerability has been resolved: spi: fix use-after-free of the add_lock mutex Commit 6098475d4cb4 ("spi: Fix deadlock when adding SPI controllers on SPI buses") introduced a per-controller mutex. But mutex_unlock() of said lock is called after the controller is already freed: spi_unregister_controller(ctlr) -> put_device(&ctlr->dev) -> spi_controller_release(dev) -> mutex_unlock(&ctrl->add_lock) Move the put_device() after the mutex_unlock().
References
https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434
https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd
https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d
https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4