diff --git a/fs/isofs/compress.c b/fs/isofs/compress.c
index 34a44e4..4917315 100644
--- a/fs/isofs/compress.c
+++ b/fs/isofs/compress.c
@@ -129,8 +129,14 @@
 	cend = le32_to_cpu(*(__le32 *)(bh->b_data + (blockendptr & bufmask)));
 	brelse(bh);
 
+	if (cstart > cend)
+		goto eio;
+		
 	csize = cend-cstart;
 
+	if (csize > deflateBound(1UL << zisofs_block_shift))
+		goto eio;
+
 	/* Now page[] contains an array of pages, any of which can be NULL,
 	   and the locks on which we hold.  We should now read the data and
 	   release the pages.  If the pages are NULL the decompressed data