[gnutls-devel] libtasn1 | Fix handling of code which uses NULL pointers + offset (fixes issue #30) (!71)

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Wed Feb 3 07:46:16 CET 2021

Stefan Weil commented:

clang may handle the undefined expression (NULL + offset) as NULL. Compile this test program with `-O2` and run it with and without an argument:

    #include <stdio.h>
    int main(int argc, char *argv[]) {
      char *p = argv[1] + argc;
      if (p != NULL) {
        printf("%p+%d => %p (%c)\n", argv[1], argc, p, *p);
      } else {
        printf("%p+%d => NULL\n", argv[1], argc);
      return 0;

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