[PATCH 5.0 48/89] ext4: fix some error pointer dereferences

[Greg Kroah-Hartman]

From: Dan Carpenter <dan.carpen...@oracle.com>

commit 7159a986b4202343f6cca3bb8079ecace5816fd6 upstream.

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.carpen...@oracle.com>
Signed-off-by: Theodore Ts'o <ty...@mit.edu>
Reviewed-by: Jan Kara <j...@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 fs/ext4/xattr.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -829,6 +829,7 @@ int ext4_get_inode_usage(struct inode *i
                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 *ha
                        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
                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) {