ext4: fix some error pointer dereferences

We can't pass error pointers to brelse().

Fixes: fb265c9cb49e ("ext4: add ext4_sb_bread() to disambiguate ENOMEM cases")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>

1 files changed, 3 insertions, 0 deletions

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 86ed9c686249..dc82e7757f67 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -829,6 +829,7 @@ int ext4_get_inode_usage(struct inode *inode, qsize_t *usage)
                 bh = ext4_sb_bread(inode->i_sb, EXT4_I(inode)->i_file_acl, REQ_PRIO);
                 if (IS_ERR(bh)) {
                         ret = PTR_ERR(bh);
+                        bh = NULL;
                         goto out;
                 }
 
@@ -2903,6 +2904,7 @@ int ext4_xattr_delete_inode(handle_t *handle, struct inode *inode,
                         if (error == -EIO)
                                 EXT4_ERROR_INODE(inode, "block %llu read error",
                                                  EXT4_I(inode)->i_file_acl);
+                        bh = NULL;
                         goto cleanup;
                 }
                 error = ext4_xattr_check_block(inode, bh);
@@ -3059,6 +3061,7 @@ ext4_xattr_block_cache_find(struct inode *inode,
                 if (IS_ERR(bh)) {
                         if (PTR_ERR(bh) == -ENOMEM)
                                 return NULL;
+                        bh = NULL;
                         EXT4_ERROR_INODE(inode, "block %lu read error",
                                          (unsigned long)ce->e_value);
                 } else if (ext4_xattr_cmp(header, BHDR(bh)) == 0) {