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[QP] Check BPP capabilities before loading the palette #16863

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KarlK90
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@KarlK90 KarlK90 commented Apr 16, 2022

Description

Loading and drawing an image with 256 colors on a firmware with 16 colors maximum enabled, leads to memory corruption because the palette is loaded before checking if it this is even possible. This overwrites unrelated memory in https://github.com/qmk/qmk_firmware/blob/develop/quantum/painter/qp_draw_core.c#L124-L141. Without the change the firmware hard-faults at runtime.

Types of Changes

  • Core
  • Bugfix
  • New feature
  • Enhancement/optimization
  • Keyboard (addition or update)
  • Keymap/layout/userspace (addition or update)
  • Documentation

Issues Fixed or Closed by This PR

Checklist

  • My code follows the code style of this project: C, Python
  • I have read the PR Checklist document and have made the appropriate changes.
  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • I have read the CONTRIBUTING document.
  • I have added tests to cover my changes.
  • I have tested the changes and verified that they work and don't break anything (as well as I can manage).

@KarlK90 KarlK90 requested a review from tzarc April 16, 2022 21:59
@github-actions github-actions bot added the core label Apr 16, 2022
@KarlK90 KarlK90 requested a review from a team April 16, 2022 21:59
@tzarc tzarc merged commit 147e57f into qmk:develop Apr 16, 2022
@KarlK90 KarlK90 deleted the fix/quantum_painter_memory_corruption_256_colors branch April 16, 2022 22:33
0xcharly pushed a commit to Bastardkb/bastardkb-qmk that referenced this pull request Jul 4, 2022
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2 participants