Revert "Remove FX_Alloc() null checks now that it can't return NULL."

This reverts commit eb6527763171cdb4b0fbfea5a20d691f4d67b660.

Reason for revert: broke javascript tests.
TBR=thestig@chromium.org

Review URL: https://codereview.chromium.org/1145843005

3 files changed, 13 insertions, 1 deletions

diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
index 691981cb10..8f5871df7f 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_decode.cpp
@@ -40,6 +40,9 @@ FX_DWORD _A85Decode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& dest_b
         return (FX_DWORD) - 1;
     }
     dest_buf = FX_Alloc(FX_BYTE, zcount * 4 + (pos - zcount));
+    if (dest_buf == NULL) {
+        return (FX_DWORD) - 1;
+    }
     int state = 0;
     FX_UINT32 res = 0;
     pos = dest_size = 0;
@@ -150,6 +153,9 @@ FX_DWORD RunLengthDecode(const FX_BYTE* src_buf, FX_DWORD src_size, FX_LPBYTE& d
         return -1;
     }
     dest_buf = FX_Alloc( FX_BYTE, dest_size);
+    if (!dest_buf) {
+        return -1;
+    }
     i = 0;
     int dest_count = 0;
     while (i < src_size) {
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
index 341be13d44..3eac5ae74e 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_objects.cpp
@@ -1086,7 +1086,7 @@ void CPDF_StreamAcc::LoadAllData(const CPDF_Stream* pStream, FX_BOOL bRawAccess,
     }
     if (!pStream->IsMemoryBased()) {
         pSrcData = m_pSrcData = FX_Alloc(FX_BYTE, dwSrcSize);
-        if (!pStream->ReadRawData(0, pSrcData, dwSrcSize)) {
+        if (!pSrcData || !pStream->ReadRawData(0, pSrcData, dwSrcSize)) {
             return;
         }
     } else {
@@ -1165,6 +1165,9 @@ FX_LPBYTE CPDF_StreamAcc::DetachData()
         return p;
     }
     FX_LPBYTE p = FX_Alloc(FX_BYTE, m_dwSize);
+    if (p == NULL) {
+        return NULL;
+    }
     FXSYS_memcpy32(p, m_pData, m_dwSize);
     return p;
 }
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
index 0d4ed27c06..2772d9825e 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.cpp
@@ -2477,6 +2477,9 @@ CPDF_Stream* CPDF_SyntaxParser::ReadStream(CPDF_Dictionary* pDict, PARSE_CONTEXT
     }
     CPDF_Stream* pStream;
     FX_LPBYTE pData = FX_Alloc(FX_BYTE, len);
+    if (!pData) {
+        return NULL;
+    }
     ReadBlock(pData, len);
     if (pCryptoHandler) {
         CFX_BinaryBuf dest_buf;