Description

In the Linux kernel, the following vulnerability has been resolved: mm/damon/core: avoid overflow in damon_feed_loop_next_input() damon_feed_loop_next_input() is inefficient and fragile to overflows. Specifically, 'score_goal_diff_bp' calculation can overflow when 'score' is high. The calculation is actually unnecessary at all because 'goal' is a constant of value 10,000. Calculation of 'compensation' is again fragile to overflow. Final calculation of return value for under-achiving case is again fragile to overflow when the current score is under-achieving the target. Add two corner cases handling at the beginning of the function to make the body easier to read, and rewrite the body of the function to avoid overflows and the unnecessary bp value calcuation.

Weaknesses 1

Affected Products 7

References 2

• git.kernel.org https://git.kernel.org/stable/c/2d339a1f0f16ff5dea58e612ff336f0be0d041e9
  Patch
• git.kernel.org https://git.kernel.org/stable/c/4401e9d10ab0281a520b9f8c220f30f60b5c248f
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/2d339a1f0f16ff5dea58e612ff336f0be0d041e9
  Patch
• git.kernel.org https://git.kernel.org/stable/c/4401e9d10ab0281a520b9f8c220f30f60b5c248f
  Patch