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Further reduce dependence on -fwrapv semantics in jsonb.

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Commit 108d2adb9e missed updating a few places in the jsonb code
that rely on signed integer wrapping for correctness.  These can
also be fixed by using pg_abs_s32() to negate a signed integer
(that is known to be negative) for comparison with an unsigned
integer.

Reported-by: Alexander Lakhin
Discussion: https://postgr.es/m/bfff906f-300d-81ea-83b7-f2c93845e7f2%40gmail.com
This commit is contained in:
Nathan Bossart 2024-08-16 15:06:40 -05:00
parent aa2d6b15d6
commit 1d80d6b50e
1 changed files with 2 additions and 2 deletions
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4
src/backend/utils/adt/jsonfuncs.c
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@ -990,7 +990,7 @@ jsonb_array_element_text(PG_FUNCTION_ARGS)
{
uint32 nelements = JB_ROOT_COUNT(jb);
if (-element > nelements)
if (pg_abs_s32(element) > nelements)
PG_RETURN_NULL();
else
element += nelements;
@ -4811,7 +4811,7 @@ jsonb_delete_idx(PG_FUNCTION_ARGS)
if (idx < 0)
{
if (-idx > n)
if (pg_abs_s32(idx) > n)
idx = n;
else
idx = n + idx;