ext4: release buffer when checksum failed

Commit b0336e8d (ext4: calculate and verify checksums of directory
leaf blocks) and commit dbe89444 (ext4: Calculate and verify checksums
for htree nodes) forget to release buffer when checksum failed, at
some places.

Signed-off-by: Guo Chao <yan@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/ext4/dir.c b/fs/ext4/dir.c
index 80a28b2..3882fbc 100644 (file)
--- a/fs/ext4/dir.c
+++ b/fs/ext4/dir.c
@@ -185,6 +185,7 @@ static int ext4_readdir(struct file *filp,
                                        "at offset %llu",
                                        (unsigned long long)filp->f_pos);
                        filp->f_pos += sb->s_blocksize - offset;
+                       brelse(bh);
                        continue;
                }
                set_buffer_verified(bh);

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index f9ed946..99813db 100644 (file)
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -837,6 +837,7 @@ static int ext4_htree_next_block(struct inode *dir, __u32 hash,
                    !ext4_dx_csum_verify(dir,
                                         (struct ext4_dir_entry *)bh->b_data)) {
                        ext4_warning(dir->i_sb, "Node failed checksum");
+                       brelse(bh);
                        return -EIO;
                }
                set_buffer_verified(bh);
@@ -877,8 +878,11 @@ static int htree_dirblock_to_tree(struct file *dir_file,
        }
 
        if (!buffer_verified(bh) &&
-           !ext4_dirent_csum_verify(dir, (struct ext4_dir_entry *)bh->b_data))
+                       !ext4_dirent_csum_verify(dir,
+                               (struct ext4_dir_entry *)bh->b_data)) {
+               brelse(bh);
                return -EIO;
+       }
        set_buffer_verified(bh);
 
        de = (struct ext4_dir_entry_2 *) bh->b_data;
@@ -1929,8 +1933,10 @@ static int ext4_add_entry(handle_t *handle, struct dentry *dentry,
                }
                if (!buffer_verified(bh) &&
                    !ext4_dirent_csum_verify(dir,
-                               (struct ext4_dir_entry *)bh->b_data))
+                               (struct ext4_dir_entry *)bh->b_data)) {
+                       brelse(bh);
                        return -EIO;
+               }
                set_buffer_verified(bh);
                retval = add_dirent_to_buf(handle, dentry, inode, NULL, bh);
                if (retval != -ENOSPC) {
@@ -2492,6 +2498,7 @@ static int empty_dir(struct inode *inode)
                        (struct ext4_dir_entry *)bh->b_data)) {
                EXT4_ERROR_INODE(inode, "checksum error reading directory "
                                 "lblock 0");
+               brelse(bh);
                return -EIO;
        }
        set_buffer_verified(bh);
@@ -2536,6 +2543,7 @@ static int empty_dir(struct inode *inode)
                                        (struct ext4_dir_entry *)bh->b_data)) {
                                EXT4_ERROR_INODE(inode, "checksum error "
                                                 "reading directory lblock 0");
+                               brelse(bh);
                                return -EIO;
                        }
                        set_buffer_verified(bh);