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V613. Strange pointer arithmetic with '…
Analyzer Diagnostics
General Analysis (C++)
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Contents

V613. Strange pointer arithmetic with 'malloc/new'.

May 12, 2012

The analyzer has detected a potential error in the code allocating memory. A pointer returned by the 'malloc' function or any other similar function is summed up with some number. It is very strange and it's highly probable that the code contains a misprint.

Consider this sample:

a = ((int *)(malloc(sizeof(int)*(3+5)))+2);

The expression contains many extraneous parentheses and the programmer must have got mixed up in them. Let's simplify this code to make it clearer:

a = (int *)malloc(sizeof(int)*8);
a += 2;

It's very strange to add number 2 to the pointer. Even if it should be so and the code is correct, it is very dangerous. For example, you might easily forget that memory should be free this way: "free(a - 2);".

This is the correct code:

a = (int *)malloc(sizeof(int)*(3+5+2));

This diagnostic is classified as:

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