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The latest version of this topic can be found at C6305.

warning C6305: potential mismatch between sizeof and countof quantities

This warning indicates that a variable holding a sizeof result is being added to or subtracted from a pointer or countof expression. This will cause unexpected scaling in pointer arithmetic.

The following code generates this warning:

void f(int *p)   
  int cb=sizeof(int);   
  p +=cb; // warning 6305  

To correct this warning, use the following code:

void f(int *p)   
  // code...  
  p += 1;