1 files changed, 10 insertions, 1 deletions
diff --git a/core/java/android/os/MemoryFile.java b/core/java/android/os/MemoryFile.java
index 7e4cf8a..c14925c 100644
--- a/core/java/android/os/MemoryFile.java
+++ b/core/java/android/os/MemoryFile.java
@@ -353,13 +353,22 @@ public class MemoryFile
             }
             int result = read(mSingleByte, 0, 1);
             if (result != 1) {
-                throw new IOException("read() failed");
+                return -1;
             }
             return mSingleByte[0];
         }
 
         @Override
         public int read(byte buffer[], int offset, int count) throws IOException {
+            if (offset < 0 || count < 0 || offset + count > buffer.length) {
+                // readBytes() also does this check, but we need to do it before
+                // changing count.
+                throw new IndexOutOfBoundsException();
+            }
+            count = Math.min(count, available());
+            if (count < 1) {
+                return -1;
+            }
             int result = readBytes(buffer, mOffset, offset, count);
             if (result > 0) {
                 mOffset += result;