---

yaml --- r: 282100 b: refs/heads/master c: 9e7860c h: refs/heads/master v: v3
git-mirror · Jan 4, 2012 · a69e5af · a69e5af
1 parent 38648f9
commit a69e5af
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Showing 3 changed files with 10 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 73db144b58a32fc39733db6a7e1fe582072ad26a
+refs/heads/master: 9e7860cee18241633eddb36a4c34c7b61d8cecbc
diff --git a/trunk/drivers/xen/xenbus/xenbus_xs.c b/trunk/drivers/xen/xenbus/xenbus_xs.c
@@ -810,6 +810,12 @@ static int process_msg(void)
 		goto out;
 	}
 
+	if (msg->hdr.len > XENSTORE_PAYLOAD_MAX) {
+		kfree(msg);
+		err = -EINVAL;
+		goto out;
+	}
+
 	body = kmalloc(msg->hdr.len + 1, GFP_NOIO | __GFP_HIGH);
 	if (body == NULL) {
 		kfree(msg);

diff --git a/trunk/include/xen/interface/io/xs_wire.h b/trunk/include/xen/interface/io/xs_wire.h
@@ -88,4 +88,7 @@ struct xenstore_domain_interface {
     XENSTORE_RING_IDX rsp_cons, rsp_prod;
 };
 
+/* Violating this is very bad.  See docs/misc/xenstore.txt. */
+#define XENSTORE_PAYLOAD_MAX 4096
+
 #endif /* _XS_WIRE_H */