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MDEV-35723: applying non-zero offset to null pointer in INSERT

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row_mysql_read_blob_ref(): Correctly handle what Field_blob::store()
generates for length=0.
This commit is contained in:
Marko Mäkelä 2025-01-17 12:34:03 +02:00
parent df602ff7fa
commit f521b8ac21
3 changed files with 21 additions and 0 deletions
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6
mysql-test/suite/innodb/r/innodb.result
View file

@ -3337,3 +3337,9 @@ Table Op Msg_type Msg_text
test.t1 check status OK
ALTER TABLE t1 FORCE;
DROP TABLE t1;
#
# MDEV-35723: applying zero offset to null pointer on INSERT
#
CREATE TABLE t1(c TEXT(1) NOT NULL, INDEX (c)) ENGINE=InnoDB;
INSERT INTO t1 SET c='';
DROP TABLE t1;

7
mysql-test/suite/innodb/t/innodb.test
View file

@ -2605,3 +2605,10 @@ CHECK TABLE t1;
ALTER TABLE t1 FORCE;
# Cleanup
DROP TABLE t1;
--echo #
--echo # MDEV-35723: applying zero offset to null pointer on INSERT
--echo #
CREATE TABLE t1(c TEXT(1) NOT NULL, INDEX (c)) ENGINE=InnoDB;
INSERT INTO t1 SET c='';
DROP TABLE t1;

8
storage/innobase/row/row0mysql.cc
View file

@ -244,6 +244,14 @@ row_mysql_read_blob_ref(
*len = mach_read_from_n_little_endian(ref, col_len - 8);
if (!*len) {
/* Field_blob::store() if (!length) would encode both
the length and the pointer in the same area. An empty
string must be a valid (nonnull) pointer in the
collation functions that cmp_data() may invoke. */
return ref;
}
memcpy(&data, ref + col_len - 8, sizeof data);
return(data);