CVE-2026-68245drm/amdgpu: fix lifetime issue of amdgpu_vm_get_task_info_pasid()

Official description

In the Linux kernel, the following vulnerability has been resolved: drm/amdgpu: fix lifetime issue of amdgpu_vm_get_task_info_pasid() The vm pointer returned from amdgpu_vm_get_vm_from_pasid() is only valid while the lock is still being held. Once xa_unlock_irqrestore is called and returned, the pointer is no longer under lock and is subject to modification. Since, the caller still dereferences vm->task_info in amdgpu_vm_get_task_info_vm() after the lock is removed, this causes a use after unlock problem. Remove the lifetime issue present in amdgpu_vm_get_task_info_pasid() through removing the amdgpu_vm_get_vm_from_pasid() function from amdgpu_vm.c and making the relevant code inline to hold the lock while it is still in use. (cherry picked from commit 9d01579f3f868b333acc901815972685989092c7)

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/fe16a7e5336ae888751984e30c451fbf7cfa5df7
• https://git.kernel.org/stable/c/1173190412fb9d12e7efce76734118d9712ff970
• https://git.kernel.org/stable/c/5d5fb9124a2bba96a7807086d8fe0f7ce810d546
• https://git.kernel.org/stable/c/04cc4aa3617b0ed67e859f91f09de5d896a46f3a