[OpenSER-Devel] [ openser-Bugs-1869566 ] [dialog] MI-command dlg_list fails on empty list

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Bugs item #1869566, was opened at 2008-01-11 19:50
Message generated for change (Comment added) made by bogdan_iancu
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Category: modules
Group: ver 1.3.x
Status: Open
Resolution: None
Priority: 7
Private: No
Submitted By: Carsten Bock (carstenbock)
Assigned to: Bogdan-Andrei Iancu (bogdan_iancu)
Summary: [dialog] MI-command dlg_list fails on empty list

Initial Comment:
Hi,

i found an tiny bug in MI-command "dlg_list" of the dialog module: It crashes OpenSER, if the list is empty. Attached patch fixes the issue.
Although the attached patch looks huge, it's mainly because of indentation. Actually, the only change is that i added the following line:

if (d_table->entries[i].first) {

The first dialog is empty (null) if the list is empty.
On our systems, the crash only appeared when creating debian-packages (for sarge), but not when compiled "by hand".

Carsten

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>Comment By: Bogdan-Andrei Iancu (bogdan_iancu)
Date: 2008-01-16 11:45

Message:
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Hi Carsten,

Looking at the patch, I fail to see what brings more. Because the
condition you added:
    if (d_table->entries[i].first) {
is also tested by the existing "for" loop:
    for( dlg=d_table->entries[i].first ; dlg ; dlg=dlg->next )

If d_table->entries[i].first, it will never get into the for loop (as dlg
will be NULL).

So basically your patch duplicates an exiting condition - quite strange
how it solves the problem.

When crashing, do you get a core file? can you take a look at the
backtrace?

Thanks and regards,
Bogdan

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