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[bug #55694] Possible bug in file grub/grub-core/fs/squash4.c line 739

From: Petru-Florin Mihancea
Subject: [bug #55694] Possible bug in file grub/grub-core/fs/squash4.c line 739
Date: Mon, 11 Feb 2019 09:39:27 -0500 (EST)
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/72.0.3626.96 Safari/537.36


                 Summary: Possible bug in file grub/grub-core/fs/squash4.c
line 739
                 Project: GNU GRUB
            Submitted by: petrum2
            Submitted on: Mon 11 Feb 2019 02:39:26 PM UTC
                Category: None
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: Git master
         Reproducibility: None
         Planned Release: None



While experimenting with a novel static analysis technique in CodeSonar, we
noticed the following potential problem at the next location:

FilePath: grub/grub-core/fs/squash4.c
Function: grub_squash_open
Line number: 739

As far as I understood from a comment for function grub_fshelp_find_file
(invoked in line 707 in the previous function), fdiro may point to root as a
result of the execution of grub_fshelp_find_file. Thus, in line 739 (and 733)
it is possible to deallocate  a non-heap address (since root is local).

Petru-Florin Mihancea


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