BUG OF THE MONTH | Unpredictable result

V567 Undefined behavior. The ‘j’ variable is modified while being used twice between sequence points. pk11slot.c 1934

PK11SlotList* PK11_GetAllTokens(....)
{
  ....
  #if defined( XP_WIN32 ) 
    waste[ j & 0xf] = j++; 
  #endif
  ....
}

The j variable is used twice in one sequence point. Because of that, you can’t predict the result of this expression. To learn more, see the description of the V567 diagnostic.

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