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MDEV-24335 Unexpected question mark in the end of a TINYTEXT column

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my_copy_fix_mb() passed MIN(src_length,dst_length) to
my_append_fix_badly_formed_tail(). It could break a multi-byte
character in the middle, which put the question mark to the
destination.

Fixing the code to pass the true src_length to
my_append_fix_badly_formed_tail().
This commit is contained in:
Alexander Barkov
2021-11-02 09:00:49 +04:00
parent 026984c360
commit d0b611a76d
3 changed files with 22 additions and 2 deletions
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11
mysql-test/r/ctype_utf8.result
View File

@@ -11256,5 +11256,16 @@ DROP TABLE kv;
DROP VIEW v1; DROP VIEW v1;
SET NAMES utf8; SET NAMES utf8;
# #
# MDEV-24335 Unexpected question mark in the end of a TINYTEXT column
#
CREATE TABLE t1 (a TINYTEXT character set utf8);
INSERT IGNORE INTO t1 VALUES (REPEAT(_utf8 0xD184, 250));
Warnings:
Warning 1366 Incorrect string value: '\xD1\x84\xD1\x84\xD1\x84...' for column `test`.`t1`.`a` at row 1
SELECT LENGTH(a), CHAR_LENGTH(a), RIGHT(a,3) FROM t1;
LENGTH(a) CHAR_LENGTH(a) RIGHT(a,3)
254 127 ффф
DROP TABLE t1;
#
# End of 10.2 tests # End of 10.2 tests
# #

9
mysql-test/t/ctype_utf8.test
View File

@@ -2183,6 +2183,15 @@ DROP TABLE kv;
DROP VIEW v1; DROP VIEW v1;
SET NAMES utf8; SET NAMES utf8;
--echo #
--echo # MDEV-24335 Unexpected question mark in the end of a TINYTEXT column
--echo #
CREATE TABLE t1 (a TINYTEXT character set utf8);
INSERT IGNORE INTO t1 VALUES (REPEAT(_utf8 0xD184, 250));
SELECT LENGTH(a), CHAR_LENGTH(a), RIGHT(a,3) FROM t1;
DROP TABLE t1;
--echo # --echo #
--echo # End of 10.2 tests --echo # End of 10.2 tests
--echo # --echo #

4
strings/ctype-mb.c
View File

@@ -401,10 +401,10 @@ my_copy_fix_mb(CHARSET_INFO *cs,
size_t well_formed_nchars; size_t well_formed_nchars;
size_t well_formed_length; size_t well_formed_length;
size_t fixed_length; size_t fixed_length;
size_t min_length= MY_MIN(src_length, dst_length);
set_if_smaller(src_length, dst_length);
well_formed_nchars= cs->cset->well_formed_char_length(cs, well_formed_nchars= cs->cset->well_formed_char_length(cs,
src, src + src_length, src, src + min_length,
nchars, status); nchars, status);
DBUG_ASSERT(well_formed_nchars <= nchars); DBUG_ASSERT(well_formed_nchars <= nchars);
well_formed_length= status->m_source_end_pos - src; well_formed_length= status->m_source_end_pos - src;