udf: Properly detect stale inodes

NFS can easily ask for inodes that are already deleted. Currently UDF happily returns such inodes which is a bug. Return -ESTALE if udf_read_inode() is asked to read deleted inode. Signed-off-by: Jan Kara <jack@suse.cz>
git-mirror · Sep 4, 2014 · 4071b91 · 4071b91
1 parent 6d3d5e8
commit 4071b91
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/fs/udf/inode.c b/fs/udf/inode.c
@@ -1435,8 +1435,10 @@ static int udf_read_inode(struct inode *inode)
 	read_unlock(&sbi->s_cred_lock);
 
 	link_count = le16_to_cpu(fe->fileLinkCount);
-	if (!link_count)
-		link_count = 1;
+	if (!link_count) {
+		ret = -ESTALE;
+		goto out;
+	}
 	set_nlink(inode, link_count);
 
 	inode->i_size = le64_to_cpu(fe->informationLength);