Fix #510: correct macCmd validity check

mcci-catena · Dec 30, 2019 · 5b4d28f · 5b4d28f
1 parent 306330f
commit 5b4d28f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/lmic/lmic.c b/src/lmic/lmic.c
@@ -721,7 +721,7 @@ static CONST_TABLE(u1_t, macCmdSize)[] = {
 static u1_t getMacCmdSize(u1_t macCmd) {
     if (macCmd < 2)
         return 0;
-    if (macCmd >= LENOF_TABLE(macCmdSize) - 2)
+    if ((macCmd - 2) >= LENOF_TABLE(macCmdSize))
         return 0;
     return TABLE_GET_U1(macCmdSize, macCmd - 2);
 }