PERFORCE change 113755 for review

[Robert Watson]

http://perforce.freebsd.org/chv.cgi?CH=113755

Change 113755 by rwatson at rwatson_cinnamon on 2007/01/31 11:16:23

	Reintroduce dropped size bound on the size of individual zero-copy
	buffer regions.

Affected files ...

.. //depot/projects/zcopybpf/src/sys/net/bpf_zerocopy.c#6 edit

Differences ...

==== //depot/projects/zcopybpf/src/sys/net/bpf_zerocopy.c#6 (text+ko) ====

@@ -196,6 +196,13 @@
 		return (EINVAL);
 	}
 
+	/* Length must not exceed per-buffer resource limit. */
+	if ((len / PAGE_SIZE) > BPF_MAX_PAGES) {
+		// printf("zbuf_setup: len %d greater than max %d\n", len,
+		//     BPF_MAX_PAGES * PAGE_SIZE);
+		return (EINVAL);
+	}
+
 	error = 0;
 	zb = malloc(sizeof(*zb), M_BPF, M_ZERO | M_WAITOK);
 	zb->zb_uaddr = uaddr;