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From: "alexhenrie24 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug analyzer/110426] New: Missing buffer overflow warning with
 function pointer that has the alloc_size attribute
Date: Tue, 27 Jun 2023 04:18:48 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: analyzer
X-Bugzilla-Version: 13.1.1
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X-Bugzilla-Severity: normal
X-Bugzilla-Who: alexhenrie24 at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: dmalcolm at gcc dot gnu.org
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110426

            Bug ID: 110426
           Summary: Missing buffer overflow warning with function pointer
                    that has the alloc_size attribute
           Product: gcc
           Version: 13.1.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: analyzer
          Assignee: dmalcolm at gcc dot gnu.org
          Reporter: alexhenrie24 at gmail dot com
  Target Milestone: ---

I expected to get a warning when compiling this program with -fanalyzer:

#include <stdlib.h>

extern void* (*my_alloc)(size_t) __attribute__ ((alloc_size (1)));

int main(void)
{
    int *x =3D my_alloc(1);
    x[0] =3D 0; // buffer overflow!
    return 0;
}

There is a warning if I call malloc instead of my_alloc.=