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The directory extent list does not have to be a continuous list of data blocks. When GRUB tries to read a non-existant member of the list, grub_xfs_read_file() will return a block of zero'ed memory. Checking for a zero'ed magic number is sufficient to skip this non-existant data block. Prior to commit 07318ee7e (fs/xfs: Fix XFS directory extent parsing) this was handled as a subtle side effect of reading the (non-existant) tail data structure. Since the block was zero'ed the computation of the number of directory entries in the block would return 0 as well. Fixes: 07318ee7e (fs/xfs: Fix XFS directory extent parsing) Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=2254370 Signed-off-by: Jon DeVree <nuxi@vault24.org> Reviewed-By: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'