Description

In the Linux kernel, the following vulnerability has been resolved: dpll: Prevent duplicate registrations Modify the internal registration helpers dpll_xa_ref_{dpll,pin}_add() to reject duplicate registration attempts. Previously, if a caller attempted to register the same pin multiple times (with the same ops, priv, and cookie) on the same device, the core silently increments the reference count and return success. This behavior is incorrect because if the caller makes these duplicate registrations then for the first one dpll_pin_registration is allocated and for others the associated dpll_pin_ref.refcount is incremented. During the first unregistration the associated dpll_pin_registration is freed and for others WARN is fired. Fix this by updating the logic to return `-EEXIST` if a matching registration is found to enforce a strict "register once" policy.

Affected Products 8

References 3

• git.kernel.org https://git.kernel.org/stable/c/236a657422a564859dcd0db7bdb486abb21a721a
  Patch
• git.kernel.org https://git.kernel.org/stable/c/dfec0501dba8f4711ef142a6a890e4812b7af88c
  Patch
• git.kernel.org https://git.kernel.org/stable/c/f3ddbaaaaf4d0633b40482f471753f9c71294a4a
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/236a657422a564859dcd0db7bdb486abb21a721a
  Patch
• git.kernel.org https://git.kernel.org/stable/c/dfec0501dba8f4711ef142a6a890e4812b7af88c
  Patch
• git.kernel.org https://git.kernel.org/stable/c/f3ddbaaaaf4d0633b40482f471753f9c71294a4a
  Patch