soc: qcom: smem_log: Pre-check user buffers
Fully validate user buffers before use as they may have been invalidated
since the VFS checks.
CRs-Fixed: 735529
Change-Id: I90183c43857a60df7ca3e85924491be363306073
Signed-off-by:
Jeffrey Hugo <jhugo@codeaurora.org>
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