Description

In the Linux kernel, the following vulnerability has been resolved: power: supply: pm8916_lbc: Fix use-after-free for extcon in IRQ handler Using the `devm_` variant for requesting IRQ _before_ the `devm_` variant for allocating/registering the `extcon` handle, means that the `extcon` handle will be deallocated/unregistered _before_ the interrupt handler (since `devm_` naturally deallocates in reverse allocation order). This means that during removal, there is a race condition where an interrupt can fire just _after_ the `extcon` handle has been freed, *but* just _before_ the corresponding unregistration of the IRQ handler has run. This will lead to the IRQ handler calling `extcon_set_state_sync()` with a freed `extcon` handle. Which usually crashes the system or otherwise silently corrupts the memory... Fix this racy use-after-free by making sure the IRQ is requested _after_ the registration of the `extcon` handle.

Weaknesses 1

Affected Products 3

References 4

• git.kernel.org https://git.kernel.org/stable/c/23067259919663580c6f81801847cfc7bd54fd1f
  Patch
• git.kernel.org https://git.kernel.org/stable/c/47abfc207ab02cf1297257e282e8048da63f0d08
  Patch
• git.kernel.org https://git.kernel.org/stable/c/48e0f68b50c344bb2d78d65dd98f93e41276ee00
  Patch
• git.kernel.org https://git.kernel.org/stable/c/9fab0120907e6965168e55b1e17cb9dfaf262b86
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/23067259919663580c6f81801847cfc7bd54fd1f
  Patch
• git.kernel.org https://git.kernel.org/stable/c/47abfc207ab02cf1297257e282e8048da63f0d08
  Patch
• git.kernel.org https://git.kernel.org/stable/c/48e0f68b50c344bb2d78d65dd98f93e41276ee00
  Patch
• git.kernel.org https://git.kernel.org/stable/c/9fab0120907e6965168e55b1e17cb9dfaf262b86
  Patch