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MDEV-35717: UBSAN: runtime errors: applying [zero|non-zero] offset to null pointer #4910

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MDEV-35717: UBSAN: runtime errors: applying [zero|non-zero] offset to null pointer #4910

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7 changes: 7 additions & 0 deletions mysql-test/main/t.result
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
#
# MDEV-35717: UBSAN: runtime errors: applying zero offset to null pointer in `my_strnncoll_utf8mb3_general1400_as_ci`, and applying non-zero offset 4 to null pointer in `my_strcoll_ascii_4bytes_found`
#
CREATE TABLE t (c INT,c2 CHAR,c3 DATE,CHECK (c>0));
ALTER TABLE t ADD INDEX (c2) USING HASH;
DROP TABLE t;
# End of 11.8 tests
10 changes: 10 additions & 0 deletions mysql-test/main/t.test
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--echo #
--echo # MDEV-35717: UBSAN: runtime errors: applying zero offset to null pointer in `my_strnncoll_utf8mb3_general1400_as_ci`, and applying non-zero offset 4 to null pointer in `my_strcoll_ascii_4bytes_found`
--echo #

CREATE TABLE t (c INT,c2 CHAR,c3 DATE,CHECK (c>0));
ALTER TABLE t ADD INDEX (c2) USING HASH;

DROP TABLE t;

--echo # End of 11.8 tests
4 changes: 2 additions & 2 deletions strings/strcoll.inl
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Expand Up @@ -226,8 +226,8 @@ MY_FUNCTION_NAME(strnncoll)(CHARSET_INFO *cs __attribute__((unused)),
const uchar *b, size_t b_length,
my_bool b_is_prefix)
{
const uchar *a_end= a + a_length;
const uchar *b_end= b + b_length;
const uchar *a_end= a ? a + a_length : NULL;
const uchar *b_end= b ? b + b_length : NULL;
for ( ; ; )
{
int a_weight, b_weight, res;
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