diff -r 454b97887c5a Lib/test/test_audioop.py
--- a/Lib/test/test_audioop.py  Fri Dec 02 19:49:02 2011 +0200
+++ b/Lib/test/test_audioop.py  Fri Dec 30 14:29:36 2011 +0400
@@ -195,10 +195,15 @@
             self.assertRaises(audioop.error, audioop.lin2lin, data, size, size2)
             self.assertRaises(audioop.error, audioop.ratecv, data, size, 1, 1, 1, state)
             self.assertRaises(audioop.error, audioop.lin2ulaw, data, size)
+            self.assertRaises(audioop.error, audioop.lin2alaw, data, size)
+            self.assertRaises(audioop.error, audioop.lin2adpcm, data, size, state)
+
+    def test_wrongsize(self):
+        data = 'abc'
+        state = None
+        for size in (-1, 3, 5):
             self.assertRaises(audioop.error, audioop.ulaw2lin, data, size)
-            self.assertRaises(audioop.error, audioop.lin2alaw, data, size)
             self.assertRaises(audioop.error, audioop.alaw2lin, data, size)
-            self.assertRaises(audioop.error, audioop.lin2adpcm, data, size, state)
             self.assertRaises(audioop.error, audioop.adpcm2lin, data, size, state)
 
 def test_main():
diff -r 454b97887c5a Modules/audioop.c
--- a/Modules/audioop.c Fri Dec 02 19:49:02 2011 +0200
+++ b/Modules/audioop.c Fri Dec 30 14:29:36 2011 +0400
@@ -1311,7 +1311,7 @@
                            &cp, &len, &size) )
         return 0;
 
-    if (!audioop_check_parameters(len, size))
+    if (!audioop_check_parameters(len*size, size))
         return NULL;
 
     if (len > PY_SSIZE_T_MAX/size) {
@@ -1380,7 +1380,7 @@
                            &cp, &len, &size) )
         return 0;
 
-    if (!audioop_check_parameters(len, size))
+    if (!audioop_check_parameters(len*size, size))
         return NULL;
 
     if (len > PY_SSIZE_T_MAX/size) {
@@ -1524,7 +1524,7 @@
                            &cp, &len, &size, &state) )
         return 0;
 
-    if (!audioop_check_parameters(len, size))
+    if (!audioop_check_parameters(len*size, size))
         return NULL;
 
     /* Decode state, should have (value, step) */