[BusyBox 0001122]: ifupdown on non-existent interface segfaults, busybox-1.3

[bugs at busybox.net]

A NOTE has been added to this issue. 
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http://busybox.net/bugs/view.php?id=1122 
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Reported By:                espakman
Assigned To:                BusyBox
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Project:                    BusyBox
Issue ID:                   1122
Category:                   Networking Support
Reproducibility:            always
Severity:                   minor
Priority:                   normal
Status:                     feedback
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Date Submitted:             12-17-2006 12:10 PST
Last Modified:              12-19-2006 12:42 PST
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Summary:                    ifupdown on non-existent interface segfaults,
busybox-1.3
Description: 
When running ifup on a non-existent interface (but configured in
/etc/network/interfaces) gives a segfault. Revision 16646 seems to
introduce the segfault.
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---------------------------------------------------------------------- 
 vda - 12-18-06 11:57  
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Show your /etc/network/interfaces please. 

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 vda - 12-18-06 13:00  
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Try attached c.patch and let us know whether that works 

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 vda - 12-18-06 13:02  
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c.patch applied in rev 16994, waiting for feedback 

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 espakman - 12-19-06 11:52  
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The segfault is gone, but now the following message is displayed on every
interface:
"ifup: don't see to have all variables for ethx/inet"
(x is 0, 1, ..)

I think it's because of the "[[ ip ....%gateway% ]]". Removed extra spaces
w/o checking" change. But haven't tested it yet. 

---------------------------------------------------------------------- 
 espakman - 12-19-06 12:37  
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Just tested and the "don't seem to have all variables" problem is not gone
with reverting the "Removed extra spaces w/o checking" part (although I'm
not sure why you did that). 

---------------------------------------------------------------------- 
 vda - 12-19-06 12:42  
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>(although I'm not sure why you did that)

Because there is no reason why we should issue " ip ... " with leading
space, I think.

Show your /etc/network/interfaces. Please. 

Issue History 
Date Modified   Username       Field                    Change               
====================================================================== 
12-17-06 12:10  espakman       New Issue                                    
12-17-06 12:10  espakman       Status                   new => assigned     
12-17-06 12:10  espakman       Assigned To               => BusyBox         
12-18-06 11:57  vda            Note Added: 0001877                          
12-18-06 13:00  vda            File Added: c.patch                          
12-18-06 13:00  vda            Note Added: 0001878                          
12-18-06 13:02  vda            Note Added: 0001879                          
12-18-06 14:52  vda            Status                   assigned => feedback
12-19-06 11:52  espakman       Note Added: 0001886                          
12-19-06 12:37  espakman       Note Added: 0001887                          
12-19-06 12:42  vda            Note Added: 0001888                          
======================================================================