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udf: Fix BUG on corrupted inode
When inode is corrupted so that extent type is invalid, some functions (such as udf_truncate_extents()) will just BUG. Check that extent type is valid when loading the inode to memory. Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>
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@ -1357,6 +1357,12 @@ static int udf_read_inode(struct inode *inode, bool hidden_inode)
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iinfo->i_alloc_type = le16_to_cpu(fe->icbTag.flags) &
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ICBTAG_FLAG_AD_MASK;
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if (iinfo->i_alloc_type != ICBTAG_FLAG_AD_SHORT &&
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iinfo->i_alloc_type != ICBTAG_FLAG_AD_LONG &&
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iinfo->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) {
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ret = -EIO;
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goto out;
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}
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iinfo->i_unique = 0;
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iinfo->i_lenEAttr = 0;
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iinfo->i_lenExtents = 0;
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