diff --git a/media/libstagefright/HTTPStream.cpp b/media/libstagefright/HTTPStream.cpp
index 4c322bf..42664b2 100644
--- a/media/libstagefright/HTTPStream.cpp
+++ b/media/libstagefright/HTTPStream.cpp
@@ -130,6 +130,9 @@
         int s, void *data, size_t size, int flags, bool sendData) {
     ssize_t result = 0;
 
+    if (s < 0) {
+        return -1;
+    }
     while (size > 0) {
         fd_set rs, ws, es;
         FD_ZERO(&rs);