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src: add Malloc() size param + overflow detection
Adds an optional second parameter to `node::Malloc()` and an optional third parameter to `node::Realloc()` giving the size/number of items to be allocated, in the style of `calloc(3)`. Use a proper overflow check using division; the previous `CHECK_GE(n * size, n);` would not detect all cases of overflow (e.g. `size == SIZE_MAX / 2 && n == 3`). PR-URL: #8482 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com> Reviewed-By: Ilkka Myller <ilkka.myller@nodefield.com>
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