mm-video-v4l2: Protect buffer access and increase input buffer size

Protect buffer access for below scenarios:

*Increase the scope of buf_lock in free_buffer to avoid access
 of freed buffer for both input and output buffers. Also, add check
 before output buffer access.

*Disallow allocate buffer mode after client has called use buffer.

Allocate additional 512 bytes of memory for input buffers on top of
allocation size as per hardware requirement.

Bug: 64340487
Test: ran POC on bullhead/nyc-dev
Change-Id: Iabbb2d7e00ff97bfc47b04386feec66976fca99a
(cherry picked from commit 83aeab22d1bdc493b3ea2f50616bb8fd460d6c74)
2 files changed
tree: 89db6069aefa36d064e28423c0446fef1c9d99d6
  3. msm8974/
  4. msm8996/
  5. msm8998/
  6. sdm845/