xfs: don't consider future format versions valid

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commit aa88019851 upstream.

In commit fe08cc5044 we reworked the valid superblock version
checks. If it is a V5 filesystem, it is always valid, then we
checked if the version was less than V4 (reject) and then checked
feature fields in the V4 flags to determine if it was valid.

What we missed was that if the version is not V4 at this point,
we shoudl reject the fs. i.e. the check current treats V6+
filesystems as if it was a v4 filesystem. Fix this.

cc: stable@vger.kernel.org
Fixes: fe08cc5044 ("xfs: open code sb verifier feature checks")
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Dave Chinner 2023-04-12 15:48:50 +10:00 • committed by Greg Kroah-Hartman

parent 2b2515b809

commit 0ae98a8b4f

1 changed files with 6 additions and 5 deletions

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fs/xfs/libxfs/xfs_sb.c

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