ltree/crc32.c: fix fragile code. Explicitly make space for the NUL when casefolding.
No known bug in the previous code, because the previous buffer (size 12) was more than large enough for folding any codepoint with enough room left for a NUL. The builtin provider's limit is 7; ICU's limit seems to be 7 also; and libc always does 1:1 mappings so the real limit is MAX_MULTIBYTE_CHAR_LEN + 1 (size 5). Reviewed-by: Heikki Linnakangas <[email protected]> Reviewed-by: Rithvika Devisetti <[email protected]> Discussion: https://postgr.es/m/[email protected] Backpatch-through: 18 Branch ------ REL_18_STABLE Details ------- https://git.postgresql.org/pg/commitdiff/8fa803dd695073a6fad49c49878b46783ac2f207 Modified Files -------------- contrib/ltree/crc32.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
