Re: [libredwg] [bug #28858] Segfaults on DWG file

[Rodrigo Rodrigues da Silva]

I think this is some dirty code I was working on. It is kind of a 
recursive logging for ObjectRef's... it was supposed to log every entity 
pointed by and ObjectRef (handle).

Decrease the logging level to 3 and you'll be fine. I will look up on 
this asap.

Rodrigo

Felipe Sanches wrote:
> Ah! And the backtrace:
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00007f503cf7570d in dwg_print_BLOCK_HEADER (dat=0x7fff5dfcca10, 
> obj=0x7f503c8193f8) at /usr/include/bits/stdio2.h:98
> 98      return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1, __fmt,
> (gdb) bt
> #0  0x00007f503cf7570d in dwg_print_BLOCK_HEADER (dat=0x7fff5dfcca10, 
> obj=0x7f503c8193f8) at /usr/include/bits/stdio2.h:98
> #1  0x00007f503cf2f34f in resolve_objectref_vector 
> (dwg=0x7fff5dfcca50) at decode.c:867
> #2  0x00007f503cf58a36 in decode_R2004 (dat=0x7fff5dfcca10, 
> dwg=0x7fff5dfcca50) at decode.c:1745
> #3  0x00007f503cf5ab7e in dwg_decode_data (dat=0x7fff5dfcca10, 
> dwg=0x7fff5dfcca50) at decode.c:343
> #4  0x00007f503cf2ad6b in dwg_read_file (filename=<value optimized 
> out>, dwg_data=0x7fff5dfcca50) at dwg.c:92
> #5  0x0000000000401479 in test_SVG (filename=0x2 <Address 0x2 out of 
> bounds>) at testSVG.c:57
> #6  0x00007f503c94f5a6 in __libc_start_main () from /lib/libc.so.6
> #7  0x0000000000400d39 in _start () at ../sysdeps/x86_64/elf/start.S:113
> (gdb)
>
> On Wed, Mar 3, 2010 at 3:33 PM, Felipe Sanches <address@hidden 
> <mailto:address@hidden>> wrote:
>
>     address@hidden:~/devel/libredwg/examples$ gdb .libs/testSVG
>     GNU gdb 6.8-debian
>     Copyright (C) 2008 Free Software Foundation, Inc.
>     License GPLv3+: GNU GPL version 3 or later
>     <http://gnu.org/licenses/gpl.html>
>     This is free software: you are free to change and redistribute it.
>     There is NO WARRANTY, to the extent permitted by law.  Type "show
>     copying"
>     and "show warranty" for details.
>     This GDB was configured as "x86_64-linux-gnu"...
>     (gdb) r ./tests/23Nightingale.dwg > /dev/null 2> error.out
>     Starting program:
>     /home/felipe/devel/libredwg/examples/.libs/testSVG
>     ./tests/23Nightingale.dwg > /dev/null 2> error.out
>
>     Program received signal SIGSEGV, Segmentation fault.
>     0x00007f503cf7570d in dwg_print_BLOCK_HEADER (dat=0x7fff5dfcca10,
>     obj=0x7f503c8193f8) at /usr/include/bits/stdio2.h:98
>     98      return __fprintf_chk (__stream, __USE_FORTIFY_LEVEL - 1,
>     __fmt,
>     (gdb)
>
>
>
>     On Wed, Mar 3, 2010 at 3:19 PM, Rodrigo Rodrigues da Silva
>     <address@hidden <mailto:address@hidden>> wrote:
>
>         Timo Lähde wrote:
>
>             Those insert_handles looks odd?
>
>         Definitely wrong. Did you get a segfault after that?