[Bug tree-optimization/113752] [14 Regression] warning: ‘%s’ directive writing up to 10218 bytes into a region of size between 0 and 10240 [-Wformat-overflow=] since r14-261-g0ef3756adf078c

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113752

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jakub at gcc dot gnu.org

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Strange, it certainly does reproduce for me:
char a[10256], b, *c, *g;
int d, e, f;

int
foo (char *j)
{
  if (__builtin_strlen (j) + __builtin_strlen (c) + __builtin_strlen (g) + 32 >
10256)
    return 0;
  __builtin_sprintf (a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
  return 1;
}

void
bar (void)
{
  foo ("wctype");
}
/volume/tor/opt/notnfs/gcc-bisect/obj/gcc/cc1.r14-8919 -quiet -O3 -Wall
pr113752.c
pr113752.c: In function ‘bar’:
pr113752.c:9:44: warning: ‘%s’ directive writing up to 10218 bytes into a
region of size between 0 and 10240 [-Wformat-overflow=]
    9 |   __builtin_sprintf (a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
      |                                            ^~
In function ‘foo’,
    inlined from ‘bar’ at pr113752.c:16:3:
pr113752.c:9:3: note: ‘__builtin_sprintf’ output between 18 and 20484 bytes
into a destination of size 10256
    9 |   __builtin_sprintf (a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/volume/tor/opt/notnfs/gcc-bisect/obj/gcc/cc1.r14-260 -quiet -O3 -Wall
pr113752.c
/volume/tor/opt/notnfs/gcc-bisect/obj/gcc/cc1.r14-261 -quiet -O3 -Wall
pr113752.c
pr113752.c: In function ‘bar’:
pr113752.c:9:44: warning: ‘%s’ directive writing up to 10218 bytes into a
region of size between 0 and 10240 [-Wformat-overflow=]
    9 |   __builtin_sprintf (a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
      |                                            ^~
In function ‘foo’,
    inlined from ‘bar’ at pr113752.c:16:3:
pr113752.c:9:3: note: ‘__builtin_sprintf’ output between 18 and 20484 bytes
into a destination of size 10256
    9 |   __builtin_sprintf (a, "%s:%s:%d:%d:%d:%c:%s\n", j, c, d, e, f, b, g);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~