Check the number of bytes to copy against the size of the
user buffer before copy to user to avoid buffer overflow.

Bug: 79422277
Change-Id: Icdd3d4e755deca19fa431e903620bd9e4c701c89
Signed-off-by: Harsh Sahu <hsahu@codeaurora.org>
Signed-off-by: Siqi Lin <siqilin@google.com>