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 (scmsmccall()) rely on the 'scm' variable.
This fixes theoretical NULL pointer exception, triggered via introducing probe deferral in SCM driver with call trace:
qcomtzmemalloc+0x70/0x1ac (P) qcomtzmemalloc+0x64/0x1ac (L) qcomscmassignmem+0x78/0x194 qcomrmtfsmemprobe+0x2d4/0x38c platform_probe+0x68/0xc8