diff options
| -rw-r--r-- | mysql-test/r/type_newdecimal.result | 13 | ||||
| -rw-r--r-- | mysql-test/t/type_newdecimal.test | 14 | ||||
| -rw-r--r-- | sql/field.cc | 6 | ||||
| -rw-r--r-- | sql/my_decimal.cc | 11 | ||||
| -rw-r--r-- | sql/my_decimal.h | 3 | ||||
| -rw-r--r-- | strings/decimal.c | 5 |
6 files changed, 41 insertions, 11 deletions
diff --git a/mysql-test/r/type_newdecimal.result b/mysql-test/r/type_newdecimal.result index 70ee3a56cf3..c301a7dd629 100644 --- a/mysql-test/r/type_newdecimal.result +++ b/mysql-test/r/type_newdecimal.result @@ -1913,4 +1913,17 @@ group by PAY.id + 1; mult v_net_with_discount v_total 1.0000 27.18 27.180000 DROP TABLE currencies, payments, sub_tasks; +# +# Bug#55436: buffer overflow in debug binary of dbug_buff in +# Field_new_decimal::store_value +# +SET SQL_MODE=''; +CREATE TABLE t1(f1 DECIMAL(44,24)) ENGINE=MYISAM; +INSERT INTO t1 SET f1 = -64878E-85; +Warnings: +Note 1265 Data truncated for column 'f1' at row 1 +SELECT f1 FROM t1; +f1 +0.000000000000000000000000 +DROP TABLE IF EXISTS t1; End of 5.1 tests diff --git a/mysql-test/t/type_newdecimal.test b/mysql-test/t/type_newdecimal.test index 2cf7ab8fbdf..31a8808da55 100644 --- a/mysql-test/t/type_newdecimal.test +++ b/mysql-test/t/type_newdecimal.test @@ -1510,5 +1510,19 @@ group by PAY.id + 1; DROP TABLE currencies, payments, sub_tasks; +--echo # +--echo # Bug#55436: buffer overflow in debug binary of dbug_buff in +--echo # Field_new_decimal::store_value +--echo # + +# this threw memory warnings on Windows. Also make sure future changes +# don't change these results, as per usual. +SET SQL_MODE=''; +CREATE TABLE t1(f1 DECIMAL(44,24)) ENGINE=MYISAM; +INSERT INTO t1 SET f1 = -64878E-85; +SELECT f1 FROM t1; +DROP TABLE IF EXISTS t1; + + --echo End of 5.1 tests diff --git a/sql/field.cc b/sql/field.cc index 11edd8bfc1a..60808042084 100644 --- a/sql/field.cc +++ b/sql/field.cc @@ -2583,7 +2583,7 @@ bool Field_new_decimal::store_value(const my_decimal *decimal_value) DBUG_ENTER("Field_new_decimal::store_value"); #ifndef DBUG_OFF { - char dbug_buff[DECIMAL_MAX_STR_LENGTH+1]; + char dbug_buff[DECIMAL_MAX_STR_LENGTH+2]; DBUG_PRINT("enter", ("value: %s", dbug_decimal_as_string(dbug_buff, decimal_value))); } #endif @@ -2598,7 +2598,7 @@ bool Field_new_decimal::store_value(const my_decimal *decimal_value) } #ifndef DBUG_OFF { - char dbug_buff[DECIMAL_MAX_STR_LENGTH+1]; + char dbug_buff[DECIMAL_MAX_STR_LENGTH+2]; DBUG_PRINT("info", ("saving with precision %d scale: %d value %s", (int)precision, (int)dec, dbug_decimal_as_string(dbug_buff, decimal_value))); @@ -2673,7 +2673,7 @@ int Field_new_decimal::store(const char *from, uint length, } #ifndef DBUG_OFF - char dbug_buff[DECIMAL_MAX_STR_LENGTH+1]; + char dbug_buff[DECIMAL_MAX_STR_LENGTH+2]; DBUG_PRINT("enter", ("value: %s", dbug_decimal_as_string(dbug_buff, &decimal_value))); #endif diff --git a/sql/my_decimal.cc b/sql/my_decimal.cc index 26377bc1562..d3db28e370f 100644 --- a/sql/my_decimal.cc +++ b/sql/my_decimal.cc @@ -95,10 +95,11 @@ int my_decimal2string(uint mask, const my_decimal *d, UNSIGNED. Hence the buffer for a ZEROFILLed value is the length the user requested, plus one for a possible decimal point, plus one if the user only wanted decimal places, but we force a leading - zero on them. Because the type is implicitly UNSIGNED, we do not - need to reserve a character for the sign. For all other cases, - fixed_prec will be 0, and my_decimal_string_length() will be called - instead to calculate the required size of the buffer. + zero on them, plus one for the '\0' terminator. Because the type + is implicitly UNSIGNED, we do not need to reserve a character for + the sign. For all other cases, fixed_prec will be 0, and + my_decimal_string_length() will be called instead to calculate the + required size of the buffer. */ int length= (fixed_prec ? (fixed_prec + ((fixed_prec == fixed_dec) ? 1 : 0) + 1) @@ -276,7 +277,7 @@ print_decimal_buff(const my_decimal *dec, const uchar* ptr, int length) const char *dbug_decimal_as_string(char *buff, const my_decimal *val) { - int length= DECIMAL_MAX_STR_LENGTH; + int length= DECIMAL_MAX_STR_LENGTH + 1; /* minimum size for buff */ if (!val) return "NULL"; (void)decimal2string((decimal_t*) val, buff, &length, 0,0,0); diff --git a/sql/my_decimal.h b/sql/my_decimal.h index a5077f397e3..97546c91da1 100644 --- a/sql/my_decimal.h +++ b/sql/my_decimal.h @@ -55,7 +55,7 @@ C_MODE_END /** maximum length of string representation (number of maximum decimal - digits + 1 position for sign + 1 position for decimal point) + digits + 1 position for sign + 1 position for decimal point, no terminator) */ #define DECIMAL_MAX_STR_LENGTH (DECIMAL_MAX_POSSIBLE_PRECISION + 2) @@ -212,6 +212,7 @@ inline uint32 my_decimal_precision_to_length(uint precision, uint8 scale, inline int my_decimal_string_length(const my_decimal *d) { + /* length of string representation including terminating '\0' */ return decimal_string_size(d); } diff --git a/strings/decimal.c b/strings/decimal.c index bda296ce832..c91a5d1a7ec 100644 --- a/strings/decimal.c +++ b/strings/decimal.c @@ -320,8 +320,8 @@ int decimal_actual_fraction(decimal_t *from) from - value to convert to - points to buffer where string representation should be stored - *to_len - in: size of to buffer - out: length of the actually written string + *to_len - in: size of to buffer (incl. terminating '\0') + out: length of the actually written string (excl. '\0') fixed_precision - 0 if representation can be variable length and fixed_decimals will not be checked in this case. Put number as with fixed point position with this @@ -338,6 +338,7 @@ int decimal2string(decimal_t *from, char *to, int *to_len, int fixed_precision, int fixed_decimals, char filler) { + /* {intg_len, frac_len} output widths; {intg, frac} places in input */ int len, intg, frac= from->frac, i, intg_len, frac_len, fill; /* number digits before decimal point */ int fixed_intg= (fixed_precision ? |