From 9ea09757fa63ad2a9bea9c846b51c1210d69c79f Mon Sep 17 00:00:00 2001
From: Narayan Kamath <narayan@google.com>
Date: Wed, 8 Oct 2014 17:35:45 +0100
Subject: [PATCH] Fix broken error check in Parcel::readBlob

mmap returns MAP_FAILED (which is -1) and not NULL on
failure.

Diagnosed by cferris.

bug: 17909809

Change-Id: I609788ebf94742ef88af002d2d3f3bc9b9e520ac
---
 libs/binder/Parcel.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/binder/Parcel.cpp b/libs/binder/Parcel.cpp
index f61eacae8..1dbb06fef 100644
--- a/libs/binder/Parcel.cpp
+++ b/libs/binder/Parcel.cpp
@@ -1281,7 +1281,7 @@ status_t Parcel::readBlob(size_t len, ReadableBlob* outBlob) const
     if (fd == int(BAD_TYPE)) return BAD_VALUE;
 
     void* ptr = ::mmap(NULL, len, PROT_READ, MAP_SHARED, fd, 0);
-    if (!ptr) return NO_MEMORY;
+    if (ptr == MAP_FAILED) return NO_MEMORY;
 
     outBlob->init(true /*mapped*/, ptr, len);
     return NO_ERROR;