CVE-2024-57985

In the Linux kernel, the following vulnerability has been resolved:

firmware: qcom: scm: Cleanup global '__scm' on probe failures

If SCM driver fails the probe, it should not leave global '__scm'

variable assigned, because external users of this driver will assume the

probe finished successfully. For example TZMEM parts ('__scm->mempool')

are initialized later in the probe, but users of it (__scm_smc_call())

rely on the '__scm' variable.

This fixes theoretical NULL pointer exception, triggered via introducing

probe deferral in SCM driver with call trace:

qcom_tzmem_alloc+0x70/0x1ac (P)

qcom_tzmem_alloc+0x64/0x1ac (L)

qcom_scm_assign_mem+0x78/0x194

qcom_rmtfs_mem_probe+0x2d4/0x38c

platform_probe+0x68/0xc8