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INT18-C

High

Likely

No

Yes

P18

L1

LANG.TYPE.AWID
LANG.TYPE.OWID
LANG.CAST.VALUE
LANG.CAST.COERCE
ALLOC.SIZE.ADDOFLOW
ALLOC.SIZE.IOFLOW
ALLOC.SIZE.MULOFLOW
ALLOC.SIZE.SUBUFLOW
ALLOC.SIZE.TRUNC
MISC.MEM.SIZE.ADDOFLOW
MISC.MEM.SIZE.BAD
MISC.MEM.SIZE.MULOFLOW
MISC.MEM.SIZE.SUBUFLOW
MISC.MEM.SIZE.TRUNC

Expression value widened by assignment
Expression value widened by other operand
Cast alters value
Coercion alters value
Addition overflow of allocation size
Integer overflow of allocation size
Multiplication overflow of allocation size
Subtraction underflow of allocation size
Truncation of allocation size
Addition overflow of size
Unreasonable size argument
Multiplication overflow of size
Subtraction underflow of size
Truncation of size

Can detect violations of this rule. It should look for patterns of (a op1 b) op2 c where

• • c has a bigger type than a or b
  • Neither a nor b is typecast to c's type
  • op2 is assignment or comparison

C1890, C1891, C1892, C1893, C1894, C1895, C4490, C4491, C4492

PORTING.CAST.SIZE

CERT_C-INT18-a
CERT_C-INT18-b
CERT_C-INT18-c

Avoid possible integer overflow in expressions in which the result is assigned to a variable of a wider integer type
Avoid possible integer overflow in expressions in which the result is compared to an expression of a wider integer type
Avoid possible integer overflow in expressions in which the result is cast to a wider integer type

CERT C: Rec. INT18-C

Checks for integer overflow and unsigned integer overflow (rec. fully covered)