[Bug c/53004] New: Segmentation fault can be overcome with dummy predefined declaration

[Bug c/53004] New: Segmentation fault can be overcome with dummy predefined declaration

[gursoyturan at iyte dot edu.tr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53004

             Bug #: 53004
           Summary: Segmentation fault can be overcome with dummy
                    predefined declaration
    Classification: Unclassified
           Product: gcc
           Version: 4.5.2
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: gursoyturan@iyte.edu.tr


The program compiles, but only runs if a dummy predefined variable is inserted
as below

float dummy=1;

[Bug c/53004] Segmentation fault can be overcome with dummy predefined declaration

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53004

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2012-04-16
     Ever Confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-04-16 09:46:46 UTC ---
There is no attached source code.
Can you attach the source code where you are having the seg fault at runtime?

I bet you have a buffer overflow in your code though.

[Bug c/53004] Segmentation fault can be overcome with dummy predefined declaration

[gursoyturan at iyte dot edu.tr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53004

--- Comment #2 from gursoyturan at iyte dot edu.tr 2012-04-16 09:57:08 UTC ---
Created attachment 27166
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27166
C-Source code

C-source code

[Bug c/53004] Segmentation fault can be overcome with dummy predefined declaration

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53004

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |RESOLVED
         Resolution|                            |INVALID

--- Comment #3 from Andreas Schwab <schwab@linux-m68k.org> 2012-04-16 10:37:17 UTC ---
You are using an uninitialized pointer.

[Bug c/53004] Segmentation fault can be overcome with dummy predefined declaration

[manu at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53004

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

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

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2012-04-16 10:48:28 UTC ---
And GCC tells you so:

manuel@gcc12:~$ ~/trunk/186353M/build/gcc/cc1 -Wall tmp.c 
tmp.c:3:6: warning: return type of ‘main’ is not ‘int’ [-Wmain]
 void main()
      ^
tmp.c: In function ‘main’:
tmp.c:8:8: warning: ‘prod_vg’ is used uninitialized in this function
[-Wuninitialized]
   multg(prod_vg);
        ^

Now that -Wuninitialized is separated from -Wmaybe-uninitialized, maybe it is
time to enable it by default.