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The above statement is evaluated at runtime allocating storage for {{s{}}} characters in stack memory. If a size argument supplied to VLAs is not a positive integer value of reasonable size, then the program may behave in an unexpected way. An attacker may be able to leverage this behavior to overwrite critical program data \[[Griffiths 06|http://felinemenace.org/papers/p63-0x0e_Shifting_the_Stack_Pointer.txt]\]. The programmer must ensure that size arguments to VLAs are valid and have not been corrupted as the result of an exceptional integer condition. |
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