Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux...

[firefly-linux-kernel-4.4.55.git] / fs / hfs / btree.c

diff --git a/fs/hfs/btree.c b/fs/hfs/btree.c
index 9b9d6395bad36127b04a67b8048d149e2bc89d3a..052f214ea6f0c39657d4cfb84e3eb96f7a391818 100644 (file)
--- a/fs/hfs/btree.c
+++ b/fs/hfs/btree.c
@@ -58,6 +58,11 @@ struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id, btree_keycmp ke
        }
        unlock_new_inode(tree->inode);
 
+       if (!HFS_I(tree->inode)->first_blocks) {
+               printk(KERN_ERR "hfs: invalid btree extent records (0 size).\n");
+               goto free_inode;
+       }
+
        mapping = tree->inode->i_mapping;
        page = read_mapping_page(mapping, 0, NULL);
        if (IS_ERR(page))