[PATCH] hfsplus: Fix error pointer dereference

[Ethan Tidmore]

The function hfs_bnode_find() can return an error pointer and is not
checked for one. Add error pointer check.

Detected by Smatch:
fs/hfsplus/brec.c:441 hfs_brec_update_parent() error: 
'fd->bnode' dereferencing possible ERR_PTR()

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Ethan Tidmore <ethantidmore06@xxxxxxxxx>
---
 fs/hfsplus/brec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/hfsplus/brec.c b/fs/hfsplus/brec.c
index 6796c1a80e99..efe79a8f1d98 100644
--- a/fs/hfsplus/brec.c
+++ b/fs/hfsplus/brec.c
@@ -434,6 +434,9 @@ static int hfs_brec_update_parent(struct hfs_find_data *fd)
 			new_node->parent = tree->root;
 		}
 		fd->bnode = hfs_bnode_find(tree, new_node->parent);
+		if (IS_ERR(fd->bnode))
+			return PTR_ERR(fd->bnode);
+
 		/* create index key and entry */
 		hfs_bnode_read_key(new_node, fd->search_key, 14);
 		cnid = cpu_to_be32(new_node->this);
-- 
2.53.0