hypfs_kill_super(): deal with failed allocations

commit a24cd490739586a7d2da3549a1844e1d7c4f4fc4 upstream.

hypfs_fill_super() might fail to allocate sbi; hypfs_kill_super()
should not oops on that.

Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index c952b981e4f28885223c7f77b51ada2299f03c6a..f7ace92bb1f6df8bd831f4dfe9eeae2aac76ab9d 100644 (file)
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -326,7 +326,7 @@ static void hypfs_kill_super(struct super_block *sb)
 
        if (sb->s_root)
                hypfs_delete_tree(sb->s_root);
-       if (sb_info->update_file)
+       if (sb_info && sb_info->update_file)
                hypfs_remove(sb_info->update_file);
        kfree(sb->s_fs_info);
        sb->s_fs_info = NULL;