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Don't copy uninitialized bytes when copying varstrings

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When using field_conv(), which is called in case of field1=field2 copy in
fill_records(), full varstring's was copied, including unitialized bytes.
This caused valgrind to compilain about usage of unitialized bytes when
using Aria static length records.
Fixed by not using memcpy when copying varstrings but instead just copy
the real bytes.
This commit is contained in:
Monty
2019-08-14 23:46:47 +03:00
parent 3f2044ae99
commit 29f9e679ad
5 changed files with 18 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
sql/field.cc
View File

@ -7613,6 +7613,17 @@ int Field_varstring::save_field_metadata(uchar *metadata_ptr)
return 2;
}
bool Field_varstring::memcpy_field_possible(const Field *from) const
{
return (Field_str::memcpy_field_possible(from) &&
!compression_method() == !from->compression_method() &&
length_bytes == ((Field_varstring*) from)->length_bytes &&
(table->file && !(table->file->ha_table_flags() &
HA_RECORD_MUST_BE_CLEAN_ON_WRITE)));
}
int Field_varstring::store(const char *from,size_t length,CHARSET_INFO *cs)
{
ASSERT_COLUMN_MARKED_FOR_WRITE_OR_COMPUTED;

7
sql/field.h
View File

@ -3463,12 +3463,7 @@ public:
length_bytes : 0);
}
Copy_func *get_copy_func(const Field *from) const;
bool memcpy_field_possible(const Field *from) const
{
return Field_str::memcpy_field_possible(from) &&
!compression_method() == !from->compression_method() &&
length_bytes == ((Field_varstring*) from)->length_bytes;
}
bool memcpy_field_possible(const Field *from) const;
int store(const char *to,size_t length,CHARSET_INFO *charset);
using Field_str::store;
#ifdef HAVE_valgrind_or_MSAN

3
sql/handler.h
View File

@ -200,7 +200,8 @@ enum enum_alter_inplace_result {
#define HA_HAS_NEW_CHECKSUM (1ULL << 38)
#define HA_CAN_VIRTUAL_COLUMNS (1ULL << 39)
#define HA_MRR_CANT_SORT (1ULL << 40)
#define HA_RECORD_MUST_BE_CLEAN_ON_WRITE (1ULL << 41) /* unused */
/* All of VARCHAR is stored, including bytes after real varchar data */
#define HA_RECORD_MUST_BE_CLEAN_ON_WRITE (1ULL << 41)
/*
This storage engine supports condition pushdown

2
storage/maria/ha_maria.cc
View File

@ -1162,7 +1162,7 @@ int ha_maria::open(const char *name, int mode, uint test_if_locked)
that all bytes in the row is properly reset.
*/
if (file->s->data_file_type == STATIC_RECORD &&
(file->s->has_varchar_fields | file->s->has_null_fields))
(file->s->has_varchar_fields || file->s->has_null_fields))
int_table_flags|= HA_RECORD_MUST_BE_CLEAN_ON_WRITE;
for (i= 0; i < table->s->keys; i++)

5
storage/myisam/ha_myisam.cc
View File

@ -863,8 +863,9 @@ int ha_myisam::open(const char *name, int mode, uint test_if_locked)
the full row to ensure we don't get any errors from valgrind and
that all bytes in the row is properly reset.
*/
if ((file->s->options & HA_OPTION_PACK_RECORD) &&
(file->s->has_varchar_fields | file->s->has_null_fields))
if (!(file->s->options &
(HA_OPTION_PACK_RECORD | HA_OPTION_COMPRESS_RECORD)) &&
(file->s->has_varchar_fields || file->s->has_null_fields))
int_table_flags|= HA_RECORD_MUST_BE_CLEAN_ON_WRITE;
for (i= 0; i < table->s->keys; i++)