[Bug libfortran/67540] string_intrinsics_inc.c sanitizer detects null pointer passed to memcpy

[zeccav at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67540

--- Comment #3 from Vittorio Zecca <zeccav at gmail dot com> ---
I believe the test case is erroneous. NULL pointers are dereferenced
in subroutines
source_check and source_check4:

if(str4 == '12a56b78') call abort()

and

if(str4 == 4_'12a56b78') call abort()

are dereferencing the null pointer str4 and this goes down to
string_intrinsics_inc.c

There are more test cases with lvz==0.
If you had a sanitized version of libgfortran you could check them by yourself.