Weakness (CWE)

CWE-469: Use of Pointer Subtraction to Determine Size

Base Draft

The product subtracts one pointer from another in order to determine size, but this calculation can be incorrect if the pointers do not exist in the same memory chunk.

How to prevent it (1 mitigation)

Implementation

Save an index variable. This is the recommended solution. Rather than subtract pointers from one another, use an index variable of the same size as the pointers in question. Use this variable to "walk" from one pointer to the other and calculate the difference. Always validate this number.

Source: MITRE CWE-469

All Critical High Medium Low Exploited only Public exploit

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