Ensure munmap matches mmap

Bug: 31350622
Change-Id: I6d3f9faec32d54360caa6706d17405e20b50966c
(cherry picked from commit aa394dd)

Author: jreck

core/jni/android/graphics/Bitmap.cpp

@@ -150,12 +150,12 @@ Bitmap::Bitmap(void* address, void* context, FreeFunc freeFunc,
     mPixelRef->unref();
 }
 
-Bitmap::Bitmap(void* address, int fd,
+Bitmap::Bitmap(void* address, int fd, size_t mappedSize,
             const SkImageInfo& info, size_t rowBytes, SkColorTable* ctable)
         : mPixelStorageType(PixelStorageType::Ashmem) {
     mPixelStorage.ashmem.address = address;
     mPixelStorage.ashmem.fd = fd;
-    mPixelStorage.ashmem.size = ashmem_get_size_region(fd);
+    mPixelStorage.ashmem.size = mappedSize;
     mPixelRef.reset(new WrappedPixelRef(this, address, info, rowBytes, ctable));
     // Note: this will trigger a call to onStrongRefDestroyed(), but
     // we want the pixel ref to have a ref count of 0 at this point
@@ -1014,7 +1014,7 @@ static jobject Bitmap_createFromParcel(JNIEnv* env, jobject, jobject parcel) {
 
         // Map the pixels in place and take ownership of the ashmem region.
         nativeBitmap = GraphicsJNI::mapAshmemPixelRef(env, bitmap.get(),
-                ctable, dupFd, const_cast<void*>(blob.data()), !isMutable);
+                ctable, dupFd, const_cast<void*>(blob.data()), size, !isMutable);
         SkSafeUnref(ctable);
         if (!nativeBitmap) {
             close(dupFd);

core/jni/android/graphics/Bitmap.h

@@ -51,8 +51,8 @@ class Bitmap {
             const SkImageInfo& info, size_t rowBytes, SkColorTable* ctable);
     Bitmap(void* address, void* context, FreeFunc freeFunc,
             const SkImageInfo& info, size_t rowBytes, SkColorTable* ctable);
-    Bitmap(void* address, int fd, const SkImageInfo& info, size_t rowBytes,
-            SkColorTable* ctable);
+    Bitmap(void* address, int fd, size_t mappedSize, const SkImageInfo& info,
+            size_t rowBytes, SkColorTable* ctable);
 
     const SkImageInfo& info() const;
 

core/jni/android/graphics/Graphics.cpp

@@ -613,7 +613,7 @@ android::Bitmap* GraphicsJNI::allocateAshmemPixelRef(JNIEnv* env, SkBitmap* bitm
         return nullptr;
     }
 
-    android::Bitmap* wrapper = new android::Bitmap(addr, fd, info, rowBytes, ctable);
+    android::Bitmap* wrapper = new android::Bitmap(addr, fd, size, info, rowBytes, ctable);
     wrapper->getSkBitmap(bitmap);
     // since we're already allocated, we lockPixels right away
     // HeapAllocator behaves this way too
@@ -623,7 +623,7 @@ android::Bitmap* GraphicsJNI::allocateAshmemPixelRef(JNIEnv* env, SkBitmap* bitm
 }
 
 android::Bitmap* GraphicsJNI::mapAshmemPixelRef(JNIEnv* env, SkBitmap* bitmap,
-        SkColorTable* ctable, int fd, void* addr, bool readOnly) {
+        SkColorTable* ctable, int fd, void* addr, size_t size, bool readOnly) {
     const SkImageInfo& info = bitmap->info();
     if (info.fColorType == kUnknown_SkColorType) {
         doThrowIAE(env, "unknown bitmap configuration");
@@ -633,7 +633,8 @@ android::Bitmap* GraphicsJNI::mapAshmemPixelRef(JNIEnv* env, SkBitmap* bitmap,
     if (!addr) {
         // Map existing ashmem region if not already mapped.
         int flags = readOnly ? (PROT_READ) : (PROT_READ | PROT_WRITE);
-        addr = mmap(NULL, ashmem_get_size_region(fd), flags, MAP_SHARED, fd, 0);
+        size = ashmem_get_size_region(fd);
+        addr = mmap(NULL, size, flags, MAP_SHARED, fd, 0);
         if (addr == MAP_FAILED) {
             return nullptr;
         }
@@ -643,7 +644,7 @@ android::Bitmap* GraphicsJNI::mapAshmemPixelRef(JNIEnv* env, SkBitmap* bitmap,
     // attempting to compute our own.
     const size_t rowBytes = bitmap->rowBytes();
 
-    android::Bitmap* wrapper = new android::Bitmap(addr, fd, info, rowBytes, ctable);
+    android::Bitmap* wrapper = new android::Bitmap(addr, fd, size, info, rowBytes, ctable);
     wrapper->getSkBitmap(bitmap);
     if (readOnly) {
         bitmap->pixelRef()->setImmutable();

core/jni/android/graphics/GraphicsJNI.h

@@ -99,7 +99,7 @@ class GraphicsJNI {
             SkColorTable* ctable);
 
     static android::Bitmap* mapAshmemPixelRef(JNIEnv* env, SkBitmap* bitmap,
-            SkColorTable* ctable, int fd, void* addr, bool readOnly);
+            SkColorTable* ctable, int fd, void* addr, size_t size, bool readOnly);
 
     /**
      * Given a bitmap we natively allocate a memory block to store the contents