[bug #61960] commands/file: null pointer dereference in knetbsd tests

[Lukas Fink]

URL:
  <https://savannah.gnu.org/bugs/?61960>

                 Summary: commands/file: null pointer dereference in knetbsd
tests
                 Project: GNU GRUB
            Submitted by: lukasfink1
            Submitted on: Sat 29 Jan 2022 09:19:31 AM UTC
                Category: Booting
                Severity: Major
                Priority: 5 - Normal
              Item Group: Software Error
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
                 Release: 
                 Release: Git master
         Discussion Lock: Any
         Reproducibility: Every Time
         Planned Release: None

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Details:

The file command (and the grub-file utility) tries to dereference a null
pointer when a file without valid ELF header is tested by one of the knetbsd
tests:


$ grub-file --is-x86-knetbsd 0002-commands-file-Fix-null-dereference.patch 
[1]    568023 segmentation fault (core dumped)  grub-file --is-x86-knetbsd
0002-commands-file-Fix-null-dereference.patch


The supplied patch fixes this and also serves as an example file to reproduce
the error (even though any file without a valid ELF header should suffice).



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File Attachments:


-------------------------------------------------------
Date: Sat 29 Jan 2022 09:19:31 AM UTC  Name:
0002-commands-file-Fix-null-dereference.patch  Size: 958B   By: lukasfink1

<http://savannah.gnu.org/bugs/download.php?file_id=52771>

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