CVE-2024-50270
mm/damon/core: avoid overflow in damon_feed_loop_next_input()
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mm/damon/core: avoid overflow in damon_feed_loop_next_input()
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.
Reserved 2024-10-21 | Published 2024-11-19 | Updated 2024-12-19 | Assigner Linuxgit.kernel.org/...c/2d339a1f0f16ff5dea58e612ff336f0be0d041e9
git.kernel.org/...c/4401e9d10ab0281a520b9f8c220f30f60b5c248f
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