btrfs: export: handle invalid inode or root reference in btrfs_get_parent()
[ Upstream commit 26b66d1d36
]
The get_parent handler looks up a parent of a given dentry, this can be
either a subvolume or a directory. The search is set up with offset -1
but it's never expected to find such item, as it would break allowed
range of inode number or a root id. This means it's a corruption (ext4
also returns this error code).
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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@ -161,8 +161,15 @@ struct dentry *btrfs_get_parent(struct dentry *child)
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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goto fail;
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if (ret == 0) {
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/*
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* Key with offset of -1 found, there would have to exist an
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* inode with such number or a root with such id.
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*/
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ret = -EUCLEAN;
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goto fail;
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}
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BUG_ON(ret == 0); /* Key with offset of -1 found */
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if (path->slots[0] == 0) {
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ret = -ENOENT;
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goto fail;
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