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9a1123dc45
my_strntoull10rnd_8bit() did not set *error when a signed negative value
was exactly LONGLONG_MIN (-9223372036854775808): that path returned the
value and left *error untouched. Callers passing an uninitialized
"int error", such as the associative array key conversion in
Type_handler_assoc_array, then read a garbage value and raised a
spurious ER_WRONG_VALUE. Field_num::get_int() and Field_year::store()
also pass an uninitialized error, and my_strntoull10rnd_mb2_or_mb4()
calls this function too.
Fix: initialize *error to 0 at function entry, like the sibling
my_strntoll_8bit() and my_strntoll_mb2_or_mb4() do, so that no exit
path can leave it unset.
The bug was introduced by commit 031f11717d (Fix all warnings given by
UBSAN, 2021-04-18), which started skipping the *error assignment when
the value equals LONGLONG_MIN.
Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>