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fix: allocate longest palindrome result by length - #1593
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Co-Authored-By: chaogeshuodiannao <chaogeshuodiannao@users.noreply.github.com>
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longestPalindrome()allocated the result withmalloc(sizeof(s)), which only reserves the size of the input pointer rather than the palindrome string. A palindrome longer than that allocation can therefore overflow the result buffer.Allocate
sz_max + 1bytes instead so the selected palindrome and its terminating null byte always fit.Validated locally with a 10-character palindrome result under AddressSanitizer.
Refs #960