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Old 08-11-08, 02:20 AM   #1
Grond
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Join Date: Aug 2008
Posts: 2
Default Null pointer dereference in /usr/lib/libGLcore.so.1

Hey all,

I can reliably cause compiz-fusion version 0.7.6 to crash with SIGSEGV due to a null pointer dereference in /usr/lib/libGLcore.so.1

The library in question is:
lrwxrwxrwx 1 root root 22 2008-08-10 23:43 /usr/lib/libGLcore.so.1 -> libGLcore.so.173.14.12*

The null pointer dereference occurs in the following snippet of code at offset 0x612ed7 in the file, because EAX=0.

612eaa: 0f 84 a5 01 00 00 je 613055 <_nv000139gl+0x2ed5>
612eb0: 8b 87 ac 03 00 00 mov 0x3ac(%edi),%eax
612eb6: c7 06 40 00 00 00 movl $0x40,(%esi)
612ebc: 89 7e 08 mov %edi,0x8(%esi)
612ebf: 89 46 10 mov %eax,0x10(%esi)
612ec2: 0f b6 44 24 1b movzbl 0x1b(%esp),%eax
612ec7: 89 46 44 mov %eax,0x44(%esi)
612eca: 8b 87 b0 03 00 00 mov 0x3b0(%edi),%eax
612ed0: 89 74 24 04 mov %esi,0x4(%esp)
612ed4: 89 04 24 mov %eax,(%esp)
612ed7: ff 90 54 09 00 00 call *0x954(%eax)
612edd: 89 34 24 mov %esi,(%esp)
612ee0: 89 c3 mov %eax,%ebx
612ee2: ff 15 0c 00 00 00 call *0xc
612ee8: 31 c0 xor %eax,%eax
612eea: 89 87 ac 03 00 00 mov %eax,0x3ac(%edi)
612ef0: 31 c0 xor %eax,%eax

At the time of crash, the registers are:

(gdb) i r
eax 0x0 0
ecx 0x0 0
edx 0x4c 76
ebx 0x0 0
esp 0xbf8d2a20 0xbf8d2a20
ebp 0xa 0xa
esi 0x81e1bd8 136190936
edi 0x861a3b0 140616624
eip 0xb739ded7 0xb739ded7
eflags 0x210206 [ PF IF RF ID ]
cs 0x73 115
ss 0x7b 123
ds 0x7b 123
es 0x7b 123
fs 0x0 0
gs 0x33 51
(gdb) bt
#0 0xb739ded7 in ?? () from /usr/lib/libGLcore.so.1
#1 0x00000000 in ?? ()

The backtrace is not very helpful, because libGLcore.so.1 does not have debug symbols.

Let me know if I can provide any other info to help debug this problem.
Attached Files
File Type: gz nvidia-bug-report.log.gz (25.3 KB, 88 views)
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