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MDEV-729 lp:998028 - Server crashes on normal shutdown in closefrm after executing a query from MyISAM table

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don't write a key value into the record buffer - a key length can be larger then the record length.
This commit is contained in:
Sergei Golubchik
2013-01-25 14:29:46 +01:00
parent 326d2d56fe
commit 7f208d3c35
3 changed files with 20 additions and 3 deletions
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8
sql/opt_range.cc
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@ -10815,9 +10815,10 @@ int QUICK_GROUP_MIN_MAX_SELECT::next_min()
*/
if (min_max_arg_part && min_max_arg_part->field->is_null())
{
uchar *tmp_key_buff= (uchar*)my_alloca(index_info->key_length);
/* Find the first subsequent record without NULL in the MIN/MAX field. */
key_copy(tmp_record, record, index_info, 0);
result= file->index_read_map(record, tmp_record,
key_copy(tmp_key_buff, record, index_info, 0);
result= file->index_read_map(record, tmp_key_buff,
make_keypart_map(real_key_parts),
HA_READ_AFTER_KEY);
/*
@ -10833,10 +10834,11 @@ int QUICK_GROUP_MIN_MAX_SELECT::next_min()
if (!result)
{
if (key_cmp(index_info->key_part, group_prefix, real_prefix_len))
key_restore(record, tmp_record, index_info, 0);
key_restore(record, tmp_key_buff, index_info, 0);
}
else if (result == HA_ERR_KEY_NOT_FOUND || result == HA_ERR_END_OF_FILE)
result= 0; /* There is a result in any case. */
my_afree(tmp_key_buff);
}
}