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[bug #39556] Video modules are not unloaded properly

From: qwertial
Subject: [bug #39556] Video modules are not unloaded properly
Date: Tue, 23 Jul 2013 16:34:21 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.71 Safari/537.36


                 Summary: Video modules are not unloaded properly
                 Project: GNU GRUB
            Submitted by: qwertial
            Submitted on: Tue 23 Jul 2013 04:34:20 PM GMT
                Category: None
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Bazaar - trunk
         Reproducibility: None
         Planned Release: None



0. insmod several video modules.
1. Run videoinfo.
2. rmmod a random video module.
3. Run videoinfo again. Observe that the video adapter did not disappear from
the list.

Doing this a few times may even trick GRUB into running an infinite loop.

In include/grub/video.h, routine grub_video_register should initialise
adapter->prev to p. Otherwise grub_list_remove is unable to remove all
references to the grub_video_adapter_t structure.


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