Summary:	ASTERISK-12318: res_config_ldap crashes consistently with "Illegal Instruction"
Reporter:	W. Michael Petullo (flyn)	Labels:
Date Opened:	2008-07-04 14:50:26	Date Closed:	2008-07-14 16:54:36
Priority:	Critical	Regression?	No
Status:	Closed/Complete	Components:	Resources/res_config_ldap
Versions:		Frequency of Occurrence
Related Issues:
Environment:		Attachments:
Description:	The problem appeared after we fixed bug ASTERISK-11960. The res_config_ldap.so module consistently crashes with an illegal instruction on the statement "if (strncasecmp("{md5}", valptr, 5) == 0)" I have looked at this quite a bit, and have not yet been able to determine what is causing this. I've looked at this with both gdb and valgrind and can't figure out the problem. I have done some experimenting as documented below. The very odd behavior seems to indicate there may be some type of memory corruption happening elsewhere. ****** ADDITIONAL INFORMATION ****** If I replace "if (strncasecmp..." with "if (1)" then the crash goes away. If I replace "if (strncasecmp..." with "if (valptr[0] == '{' && valptr[0] == 'M'..." then the crash goes away. If I add a "printf("foo\n");" to the realtime_ldap_result_to_vars function between: if (strncasecmp(valptr, "{md5}", 5) == 0) { and: valptr += 5; then the "illegal instruction" error goes away and the realtime LDAP driver works.
Comments:	By: Tilghman Lesher (tilghman) 2008-07-05 10:00:51 Please report this upstream to the GCC project.  As you correctly attested, there is nothing wrong with the code, but your version of GCC is generating invalid code. By: Tilghman Lesher (tilghman) 2008-07-14 16:54:36 Closing.  Not a bug in Asterisk.