[asterisk-bugs] [Asterisk 0011102]: ast_unescape_semicolon causes SIP NOTIFY to loop for snom-check-cfg and snom-reboot

[noreply at bugs.digium.com]

A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=11102 
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Reported By:                fabianhoppe
Assigned To:                
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Project:                    Asterisk
Issue ID:                   11102
Category:                   Channels/chan_sip/General
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     new
Asterisk Version:           1.4.13  
SVN Branch (only for SVN checkouts, not tarball releases): N/A  
SVN Revision (number only!):  
Disclaimer on File?:        N/A 
Request Review:              
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Date Submitted:             10-29-2007 03:43 CDT
Last Modified:              10-29-2007 07:31 CDT
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Summary:                    ast_unescape_semicolon causes SIP NOTIFY to loop for
snom-check-cfg and snom-reboot
Description: 
When executing a SIP NOTIFY, the called message from sip_notify.conf is
read and "unescaped" by calling utils.c/ast_unescape_semicolon. Most
notifies don't contain semicolons but snom-check-cfg and snom-reboot.

The first SIP NOTIFY sip-check-cfg works fine but executing this command a
second time results in the SIP NOTIFY is being executed and hanging in a
loop. The Asterisk process starts to consume 100% CPU and needs to get
restarted.

This is caused through an error in utils.c/ast_unescape_semicolon which
parses through the notify message and replaces the "\;" by ";". This works
fine the first time, the command is called but any further initiation
results in a loop as all semicolon are already "unescaped". 

The code finds a ';' in the variable e but the if-statement is false as no
matching '\\' exists at (e-1). Therefore the while condition stay true for
ever. Please under "additional information" for a bug fix.
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---------------------------------------------------------------------- 
 tbelder - 10-29-07 07:31  
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Is duplicate of bug 10550... 

Issue History 
Date Modified   Username       Field                    Change               
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10-29-07 07:31  tbelder        Note Added: 0072613                          
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