sigProcLib: Check return status on downsampling

Improper length values will cause the polyphase resampler
rotation to fail. Check return and return NULL on error.

Change-Id: I3ad22f9fd7a20754f589c04258dcca3770474a9b
Fixes: Coverity CID 165235

1 files changed, 6 insertions, 2 deletions

diff --git a/Transceiver52M/sigProcLib.cpp b/Transceiver52M/sigProcLib.cpp
index 9673d99..4bb41a9 100644
--- a/Transceiver52M/sigProcLib.cpp
+++ b/Transceiver52M/sigProcLib.cpp
@@ -1962,8 +1962,12 @@ signalVector *downsampleBurst(const signalVector &burst)
   out = new signalVector(DOWNSAMPLE_OUT_LEN);
   memcpy(in->begin(), burst.begin(), DOWNSAMPLE_IN_LEN * 2 * sizeof(float));
 
-  dnsampler->rotate((float *) in->begin(), DOWNSAMPLE_IN_LEN,
-                    (float *) out->begin(), DOWNSAMPLE_OUT_LEN);
+  if (dnsampler->rotate((float *) in->begin(), DOWNSAMPLE_IN_LEN,
+                        (float *) out->begin(), DOWNSAMPLE_OUT_LEN) < 0) {
+    delete out;
+    out = NULL;
+  }
+
   delete in;
   return out;
 };