diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index a624c3e..0509ced 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -481,6 +481,8 @@
 		pgdata = kmap(page);
 		if (compr_len == 0)
 			; /* hole */
+		else if (compr_len > (PAGE_CACHE_SIZE << 1))
+			printk(KERN_ERR "cramfs: bad compressed blocksize %u\n", compr_len);
 		else {
 			mutex_lock(&read_mutex);
 			bytes_filled = cramfs_uncompress_block(pgdata,