[asterisk-bugs] [DAHDI 0013044]: Kernel oops from NULL pointer dereference in ioctl_echocancel

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A NOTE has been added to this issue. 
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http://bugs.digium.com/view.php?id=13044 
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Reported By:                jpeeler
Assigned To:                sruffell
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Project:                    DAHDI
Issue ID:                   13044
Category:                   dahdi (the module)
Reproducibility:            always
Severity:                   crash
Priority:                   normal
Status:                     assigned
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Date Submitted:             07-10-2008 00:20 CDT
Last Modified:              07-10-2008 22:26 CDT
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Summary:                    Kernel oops from NULL pointer dereference in
ioctl_echocancel
Description: 
I set up the MG2 echo canceller module for use with my FXO device. I was
attempting to test echo using the Echo application. After dialing the
extension for Echo the line goes dead and DAHDI becomes unusable. Below is
the dmesg output.

Running on Fedora 9 using SVN r4593 from /dahdi/linux/trunk.

system.conf:
loadzone=us
defaultzone=us
echocanceler=MG2,3
fxsks=2
fxoks=3

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---------------------------------------------------------------------- 
 jpeeler - 07-10-08 22:26  
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There were no warning messages in dmesg. I am embarrassed to admit I tested
rather hastily and did not see this output at the console:

-- Starting simple switch on 'DAHDI/3-1'
[Jul 10 22:30:18] WARNING[5856]: chan_dahdi.c:1648 dahdi_enable_ec: Unable
to enable echo cancellation on channel 3 (No such device)
-- Executing [2222 at phone:1] Echo("DAHDI/3-1", "") in new stack
== Spawn extension (phone, 2222, 1) exited non-zero on 'DAHDI/3-1'
-- Hungup 'DAHDI/3-1' 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
07-10-08 22:26  jpeeler        Note Added: 0090066                          
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