jbd2: deregister proc on failure in jbd2_journal_init_inode

jbd2_journal_init_inode() does not call jbd2_stats_proc_exit() on all
failure paths after calling jbd2_stats_proc_init(). This leaves
dangling references to the fs in proc.

This patch fixes a bug reported by Sami Leides at:
http://bugzilla.kernel.org/show_bug.cgi?id=11493

Signed-off-by: Sami Liedes <sliedes@cc.hut.fi>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 2 insertions, 0 deletions

diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c
index 783de118de92..e70d657a19f8 100644
--- a/fs/jbd2/journal.c
+++ b/fs/jbd2/journal.c
@@ -1089,6 +1089,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
         if (!journal->j_wbuf) {
                 printk(KERN_ERR "%s: Cant allocate bhs for commit thread\n",
                         __func__);
+                jbd2_stats_proc_exit(journal);
                 kfree(journal);
                 return NULL;
         }
@@ -1098,6 +1099,7 @@ journal_t * jbd2_journal_init_inode (struct inode *inode)
         if (err) {
                 printk(KERN_ERR "%s: Cannnot locate journal superblock\n",
                        __func__);
+                jbd2_stats_proc_exit(journal);
                 kfree(journal);
                 return NULL;
         }