Replace variable-length arrays on stack with malloc.

Bug: 30202619
Change-Id: Ib95e08a1c009d88a4b4fd8d8fdba0641c6129008
(cherry picked from commit 943905bb)

libril/RilSapSocket.cpp

@@ -343,7 +343,12 @@ void RilSapSocket::sendResponse(MsgHeader* hdr) {
     if ((success = pb_get_encoded_size(&encoded_size, MsgHeader_fields,
         hdr)) && encoded_size <= INT32_MAX && commandFd != -1) {
         buffer_size = encoded_size + sizeof(uint32_t);
-        uint8_t buffer[buffer_size];
+        uint8_t* buffer = (uint8_t*)malloc(buffer_size);
+        if (!buffer) {
+            RLOGE("sendResponse: OOM");
+            pthread_mutex_unlock(&write_lock);
+            return;
+        }
         written_size = htonl((uint32_t) encoded_size);
         ostream = pb_ostream_from_buffer(buffer, buffer_size);
         pb_write(&ostream, (uint8_t *)&written_size, sizeof(written_size));
@@ -365,6 +370,7 @@ void RilSapSocket::sendResponse(MsgHeader* hdr) {
             RLOGE("Error while encoding response of type %d id %d buffer_size: %d: %s.",
             hdr->type, hdr->id, buffer_size, PB_GET_ERROR(&ostream));
         }
+        free(buffer);
     } else {
     RLOGE("Not sending response type %d: encoded_size: %u. commandFd: %d. encoded size result: %d",
         hdr->type, encoded_size, commandFd, success);
@@ -436,7 +442,11 @@ void RilSapSocket::sendDisconnect() {
    if ((success = pb_get_encoded_size(&encoded_size, RIL_SIM_SAP_DISCONNECT_REQ_fields,
         &disconnectReq)) && encoded_size <= INT32_MAX) {
         buffer_size = encoded_size + sizeof(uint32_t);
-        uint8_t buffer[buffer_size];
+        uint8_t* buffer = (uint8_t*)malloc(buffer_size);
+        if (!buffer) {
+            RLOGE("sendDisconnect: OOM");
+            return;
+        }
         written_size = htonl((uint32_t) encoded_size);
         ostream = pb_ostream_from_buffer(buffer, buffer_size);
         pb_write(&ostream, (uint8_t *)&written_size, sizeof(written_size));
@@ -468,6 +478,7 @@ void RilSapSocket::sendDisconnect() {
         else {
             RLOGE("Encode failed in send disconnect!");
         }
+        free(buffer);
     }
 }