msm: mdss: validate input args of mdss_overlay_compat_ioctl
check if ovlist32 arg is valid before dereferencing it to avoid NULL ptr or an invalid address access. Change-Id: Ice0845ad0afdb20d7e101f114fc0a443d6aff19a Signed-off-by:Nirmal Abraham <nabrah@codeaurora.org> Signed-off-by:
Raghavendra Ambadas <rambad@codeaurora.org>
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