ext4: Fix buffer head leaks after calls to ext4_get_inode_loc()

Calls to ext4_get_inode_loc() returns with a reference to a buffer
head in iloc->bh.  The callers of this function in ext4_write_inode()
when in no journal mode and in ext4_xattr_fiemap() don't release the
buffer head after using it.

Addresses-Google-Bug: #2548165

Signed-off-by: Curt Wohlgemuth <curtw@google.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

2 files changed, 2 insertions, 0 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 94c8ee81f5e1..236b834b4ca8 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3879,6 +3879,7 @@ static int ext4_xattr_fiemap(struct inode *inode,
                 physical += offset;
                 length = EXT4_SB(inode->i_sb)->s_inode_size - offset;
                 flags |= FIEMAP_EXTENT_DATA_INLINE;
+                brelse(iloc.bh);
         } else { /* external block */
                 physical = EXT4_I(inode)->i_file_acl << blockbits;
                 length = inode->i_sb->s_blocksize;
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 87e3c70d0692..ba1eee847e32 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5385,6 +5385,7 @@ int ext4_write_inode(struct inode *inode, struct writeback_control *wbc)
                                    (unsigned long long)iloc.bh->b_blocknr);
                         err = -EIO;
                 }
+                brelse(iloc.bh);
         }
         return err;
 }