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ICU-22790 Out-of-bounds read in countSpaces() found by CHERI #3024

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ICU-22790 Out-of-bounds read in countSpaces() found by CHERI #3024

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Commits on Jun 4, 2024

  1. ICU-22790 Eliminate an out-of-bounds read 

    Check if an iterator is within bounds before accessing memory.
Also, remove a redundant variable to make the while condition more
clear.

This issue was found [1] by running Konsole on CheriBSD/Morello that was
compiled for CheriABI. The out of bounds read triggered a CHERI
capability violation.

[1] CTSRD-CHERI/cheribsd-ports#160
    @kwitaszczyk
    kwitaszczyk committed Jun 4, 2024
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