Abort on OOM by default in FX_Alloc().

Add a FX_TryAlloc() for those few cases where we might need to continue
in face of OOM.

Remove FX_AllocNL() (the context of its use would suggest that NL
means "No Limit"). This is used for some big allocations, so replace
it with TryAlloc().  Large allocations may be worth trying to continue
from, since there are few and they have a large chance of failing.

R=thestig@chromium.org

Review URL: https://codereview.chromium.org/1128043009

6 files changed, 63 insertions, 13 deletions

diff --git a/core/src/fxcodec/codec/fx_codec.cpp b/core/src/fxcodec/codec/fx_codec.cpp
index d4df1965fb..e8aad711f3 100644
--- a/core/src/fxcodec/codec/fx_codec.cpp
+++ b/core/src/fxcodec/codec/fx_codec.cpp
@@ -119,7 +119,7 @@ void CCodec_ScanlineDecoder::DownScale(int dest_width, int dest_height)
         FX_Free(m_pDataCache);
         m_pDataCache = NULL;
     }
-    m_pDataCache = (CCodec_ImageDataCache*)FX_AllocNL(FX_BYTE, sizeof(CCodec_ImageDataCache) + m_Pitch * m_OutputHeight);
+    m_pDataCache = (CCodec_ImageDataCache*)FX_TryAlloc(FX_BYTE, sizeof(CCodec_ImageDataCache) + m_Pitch * m_OutputHeight);
     if (m_pDataCache == NULL) {
         return;
     }
diff --git a/core/src/fxcrt/fx_basic_memmgr.cpp b/core/src/fxcrt/fx_basic_memmgr.cpp
index 3b3211c20f..63c609daec 100644
--- a/core/src/fxcrt/fx_basic_memmgr.cpp
+++ b/core/src/fxcrt/fx_basic_memmgr.cpp
@@ -4,10 +4,9 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
-#include "../../include/fxcrt/fx_basic.h"
-#ifdef __cplusplus
-extern "C" {
-#endif
+#include <stdlib.h>  // For abort().
+#include "../../include/fxcrt/fx_memory.h"
+
 void*	FXMEM_DefaultAlloc(size_t byte_size, int flags)
 {
     return (void*)malloc(byte_size);
@@ -20,9 +19,13 @@ void	FXMEM_DefaultFree(void* pointer, int flags)
 {
     free(pointer);
 }
-#ifdef __cplusplus
+
+NEVER_INLINE void FX_OutOfMemoryTerminate() {
+    // Termimate cleanly if we can, else crash at a specific address (0xbd).
+    abort();
+    reinterpret_cast<void(*)()>(0xbd)();
 }
-#endif
+
 CFX_GrowOnlyPool::CFX_GrowOnlyPool(size_t trunk_size)
 {
     m_TrunkSize = trunk_size;
diff --git a/core/src/fxcrt/fx_basic_memmgr_unittest.cpp b/core/src/fxcrt/fx_basic_memmgr_unittest.cpp
new file mode 100644
index 0000000000..20fd93d3f8
--- /dev/null
+++ b/core/src/fxcrt/fx_basic_memmgr_unittest.cpp
@@ -0,0 +1,47 @@
+// Copyright 2015 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <limits>
+
+#include "testing/gtest/include/gtest/gtest.h"
+#include "../../include/fxcrt/fx_memory.h"
+
+namespace {
+
+const size_t kMaxByteAlloc = std::numeric_limits<size_t>::max();
+const size_t kMaxIntAlloc = kMaxByteAlloc / sizeof(int);
+const size_t kOverflowIntAlloc = kMaxIntAlloc + 100;
+
+}  // namespace
+
+TEST(fxcrt, FX_AllocOOM) {
+    EXPECT_DEATH_IF_SUPPORTED(FX_Alloc(int, kMaxIntAlloc), "");
+    EXPECT_DEATH_IF_SUPPORTED(FX_Alloc(int, kOverflowIntAlloc), "");
+
+    int* ptr = FX_Alloc(int, 1);
+    EXPECT_TRUE(ptr);
+    EXPECT_DEATH_IF_SUPPORTED(FX_Realloc(int, ptr, kMaxIntAlloc), "");
+    EXPECT_DEATH_IF_SUPPORTED(FX_Realloc(int, ptr, kOverflowIntAlloc), "");
+    FX_Free(ptr);
+}
+
+TEST(fxcrt, FX_TryAllocOOM) {
+    EXPECT_FALSE(FX_TryAlloc(int, kMaxIntAlloc));
+    EXPECT_FALSE(FX_TryAlloc(int, kOverflowIntAlloc));
+
+    int* ptr = FX_Alloc(int, 1);
+    EXPECT_TRUE(ptr);
+    EXPECT_FALSE(FX_TryRealloc(int, ptr, kMaxIntAlloc));
+    EXPECT_FALSE(FX_TryRealloc(int, ptr, kOverflowIntAlloc));
+    FX_Free(ptr);
+}
+
+TEST(fxcrt, FXMEM_DefaultOOM) {
+    EXPECT_FALSE(FXMEM_DefaultAlloc(kMaxByteAlloc, 0));
+
+    void* ptr = FXMEM_DefaultAlloc(1, 0);
+    EXPECT_TRUE(ptr);
+    EXPECT_FALSE(FXMEM_DefaultRealloc(ptr, kMaxByteAlloc, 0));
+    FXMEM_DefaultFree(ptr, 0);
+}
diff --git a/core/src/fxge/dib/fx_dib_convert.cpp b/core/src/fxge/dib/fx_dib_convert.cpp
index 5b85c7d756..4a8befe5e3 100644
--- a/core/src/fxge/dib/fx_dib_convert.cpp
+++ b/core/src/fxge/dib/fx_dib_convert.cpp
@@ -1008,7 +1008,7 @@ FX_BOOL CFX_DIBitmap::ConvertFormat(FXDIB_Format dest_format, void* pIccTransfor
     }
     int dest_bpp = dest_format & 0xff;
     int dest_pitch = (dest_bpp * m_Width + 31) / 32 * 4;
-    FX_LPBYTE dest_buf = FX_AllocNL(FX_BYTE, dest_pitch * m_Height + 4);
+    FX_LPBYTE dest_buf = FX_TryAlloc(FX_BYTE, dest_pitch * m_Height + 4);
     if (dest_buf == NULL) {
         return FALSE;
     }
diff --git a/core/src/fxge/dib/fx_dib_engine.cpp b/core/src/fxge/dib/fx_dib_engine.cpp
index 997ca1d7b4..5053c306f5 100644
--- a/core/src/fxge/dib/fx_dib_engine.cpp
+++ b/core/src/fxge/dib/fx_dib_engine.cpp
@@ -28,7 +28,7 @@ void CWeightTable::Calc(int dest_len, int dest_min, int dest_max, int src_len, i
     if ((dest_max - dest_min) > (int)((1U << 30) - 4) / m_ItemSize) {
         return;
     }
-    m_pWeightTables = FX_AllocNL(FX_BYTE, (dest_max - dest_min) * m_ItemSize + 4);
+    m_pWeightTables = FX_TryAlloc(FX_BYTE, (dest_max - dest_min) * m_ItemSize + 4);
     if (m_pWeightTables == NULL) {
         return;
     }
@@ -202,7 +202,7 @@ CStretchEngine::CStretchEngine(IFX_ScanlineComposer* pDestBitmap, FXDIB_Format d
     }
     size += 31;
     size = size / 32 * 4;
-    m_pDestScanline = FX_AllocNL(FX_BYTE, size);
+    m_pDestScanline = FX_TryAlloc(FX_BYTE, size);
     if (m_pDestScanline == NULL) {
         return;
     }
@@ -311,7 +311,7 @@ FX_BOOL CStretchEngine::StartStretchHorz()
     if (m_DestWidth == 0 || m_pDestScanline == NULL || m_SrcClip.Height() > (int)((1U << 29) / m_InterPitch) || m_SrcClip.Height() == 0) {
         return FALSE;
     }
-    m_pInterBuf = FX_AllocNL(unsigned char, m_SrcClip.Height() * m_InterPitch);
+    m_pInterBuf = FX_TryAlloc(unsigned char, m_SrcClip.Height() * m_InterPitch);
     if (m_pInterBuf == NULL) {
         return FALSE;
     }
@@ -321,7 +321,7 @@ FX_BOOL CStretchEngine::StartStretchHorz()
             return FALSE;
         }
         FX_DWORD size = (m_DestClip.Width() * 8 + 31) / 32 * 4;
-        m_pDestMaskScanline = FX_AllocNL(unsigned char, size);
+        m_pDestMaskScanline = FX_TryAlloc(unsigned char, size);
         if (!m_pDestMaskScanline) {
             return FALSE;
         }
diff --git a/core/src/fxge/dib/fx_dib_main.cpp b/core/src/fxge/dib/fx_dib_main.cpp
index 59c0bd6749..a54c9abed0 100644
--- a/core/src/fxge/dib/fx_dib_main.cpp
+++ b/core/src/fxge/dib/fx_dib_main.cpp
@@ -84,7 +84,7 @@ FX_BOOL CFX_DIBitmap::Create(int width, int height, FXDIB_Format format, FX_LPBY
         int size = pitch * height + 4;
         int oomlimit = _MAX_OOM_LIMIT_;
         if (oomlimit >= 0 && size >= oomlimit) {
-            m_pBuffer = FX_AllocNL(FX_BYTE, size);
+            m_pBuffer = FX_TryAlloc(FX_BYTE, size);
         } else {
             m_pBuffer = FX_Alloc(FX_BYTE, size);
         }