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MDEV-22715: SIGSEGV in radixsort_for_str_ptr and in native_compare/my_qsort2 (optimized builds)

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For DECIMAL[(M[,D])] datatype max_sort_length was not being honoured which was leading to buffer
overflow while making the sort key. The fix to this problem would be to create sort keys for decimals
with atmost max_sort_key bytes

Important:
The minimum value of max_sort_length has been raised to 8 (previously was 4),
so fixed size datatypes like DOUBLE and BIGINIT are not truncated for
lower values of max_sort_length.
This commit is contained in:
Varun Gupta
2020-05-29 00:32:08 +05:30
parent 3f019d1771
commit f30ff10c8d
23 changed files with 135 additions and 47 deletions
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mysql-test/suite/sys_vars/r/sysvars_server_embedded.result
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@ -2033,7 +2033,7 @@ DEFAULT_VALUE 1024
VARIABLE_SCOPE SESSION
VARIABLE_TYPE BIGINT UNSIGNED
VARIABLE_COMMENT The number of bytes to use when sorting BLOB or TEXT values (only the first max_sort_length bytes of each value are used; the rest are ignored)
NUMERIC_MIN_VALUE 4
NUMERIC_MIN_VALUE 8
NUMERIC_MAX_VALUE 8388608
NUMERIC_BLOCK_SIZE 1
ENUM_VALUE_LIST NULL