Linux Kernel NULL Pointer Dereference Vulnerability in QCOM SCM Driver

A vulnerability in the Linux kernel's QCOM SCM driver can lead to a theoretical NULL pointer dereference. This issue arises when the SCM driver fails to properly clean up the global '__scm' variable upon probe failures. External users of the driver, such as those relying on the '__scm->mempool' for TZMEM parts, may assume the probe was successful and encounter a NULL pointer exception. The vulnerability is triggered by introducing probe deferral in the SCM driver, disrupting the expected initialization sequence.

Impact

Exploitation of this vulnerability could lead to a NULL pointer dereference, causing a crash or instability in the system.