[S390] hypfs crashes with invalid mount option.

[Martin Schwidefsky <schwidefsky@de.ibm.com>]

From: Michael Holzheu <holzheu@de.ibm.com>

[S390] hypfs crashes with invalid mount option.

When an invalid mount option is specified, no root inode is created
for hypfs, hypfs_fill_super() returns with -EINVAL and then
hypfs_kill_super() is called. hypfs_kill_super() does not check if
the root inode has been initialized. This patch adds this check.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
---

 arch/s390/hypfs/inode.c |   10 ++++++----
 1 files changed, 6 insertions(+), 4 deletions(-)

diff -urpN linux-2.6/arch/s390/hypfs/inode.c linux-2.6-patched/arch/s390/hypfs/inode.c
--- linux-2.6/arch/s390/hypfs/inode.c	2006-09-20 15:52:40.000000000 +0200
+++ linux-2.6-patched/arch/s390/hypfs/inode.c	2006-09-20 15:53:15.000000000 +0200
@@ -312,10 +312,12 @@ static void hypfs_kill_super(struct supe
 {
 	struct hypfs_sb_info *sb_info = sb->s_fs_info;
 
-	hypfs_delete_tree(sb->s_root);
-	hypfs_remove(sb_info->update_file);
-	kfree(sb->s_fs_info);
-	sb->s_fs_info = NULL;
+	if (sb->s_root) {
+		hypfs_delete_tree(sb->s_root);
+		hypfs_remove(sb_info->update_file);
+		kfree(sb->s_fs_info);
+		sb->s_fs_info = NULL;
+	}
 	kill_litter_super(sb);
 }
 
-
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