- ACSE: fixed out-of-bound read in parseAarqPdu/parseAarePdu functions (#512)(#513)(LIB61850-441)(LIB61850-442)

src/mms/iso_acse/acse.c

@@ -190,10 +190,18 @@ parseAarePdu(AcseConnection* self, uint8_t* buffer, int bufPos, int maxBufPos)
 
         bufPos = BerDecoder_decodeLength(buffer, &len, bufPos, maxBufPos);
 
+        if (bufPos < 0)
+        {
+            if (DEBUG_ACSE)
+                printf("ACSE: Invalid PDU!\n");
+            return ACSE_ERROR;
+        }
+
         if (len == 0)
             continue;
 
-        if ((bufPos < 0) || (bufPos + len > maxBufPos)) {
+        if (bufPos + len > maxBufPos)
+        {
             if (DEBUG_ACSE)
                 printf("ACSE: Invalid PDU!\n");
             return ACSE_ERROR;
@@ -279,7 +287,18 @@ parseAarqPdu(AcseConnection* self, uint8_t* buffer, int bufPos, int maxBufPos)
 
         bufPos = BerDecoder_decodeLength(buffer, &len, bufPos, maxBufPos);
 
-        if (bufPos < 0) {
+        if (bufPos < 0)
+        {
+            if (DEBUG_ACSE)
+                printf("ACSE: Invalid PDU!\n");
+            return ACSE_ASSOCIATE_FAILED;
+        }
+
+        if (len == 0)
+            continue;
+
+        if (bufPos + len > maxBufPos)
+        {
             if (DEBUG_ACSE)
                 printf("ACSE: Invalid PDU!\n");
             return ACSE_ASSOCIATE_FAILED;