[Bug middle-end/78519] missing warning for sprintf %s with null pointer

["msebor at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78519

--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Author: msebor
Date: Thu Dec 15 04:35:31 2016
New Revision: 243684

URL: https://gcc.gnu.org/viewcvs?rev=243684&root=gcc&view=rev
Log:
PR middle-end/78519 - missing warning for sprintf %s with null pointer

gcc/ChangeLog:

        PR middle-end/78519
        * gimple-ssa-sprintf.c (format_string): Handle null pointers.
        (format_directive): Diagnose null pointer arguments.
        (pass_sprintf_length::handle_gimple_call): Diagnose null destination
        pointers.  Correct location of null format string in diagnostics.

gcc/testsuite/ChangeLog:

        PR middle-end/78519
        * gcc.dg/tree-ssa/builtin-sprintf-warn-7.c: New test.


Added:
    trunk/gcc/testsuite/gcc.dg/tree-ssa/builtin-sprintf-warn-8.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/gimple-ssa-sprintf.c
    trunk/gcc/testsuite/ChangeLog