ext2: Fix error handling on inode bitmap corruption

When insert_inode_locked() fails in ext2_new_inode() it most likely means inode
bitmap got corrupted and we allocated again inode which is already in use. Also
doing unlock_new_inode() during error recovery is wrong since the inode does
not have I_NEW set. Fix the problem by informing about filesystem error and
jumping to fail: (instead of fail_drop:) which doesn't call unlock_new_inode().

Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>

1 files changed, 5 insertions, 2 deletions

diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index c4e81dfb74ba..78502c166814 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -573,8 +573,11 @@ got:
         inode->i_generation = sbi->s_next_generation++;
         spin_unlock(&sbi->s_next_gen_lock);
         if (insert_inode_locked(inode) < 0) {
-                err = -EINVAL;
-                goto fail_drop;
+                ext2_error(sb, "ext2_new_inode",
+                           "inode number already in use - inode=%lu",
+                           (unsigned long) ino);
+                err = -EIO;
+                goto fail;
         }
 
         dquot_initialize(inode);