2 files changed, 10 insertions, 3 deletions
diff --git a/llvm/lib/Bitcode/Reader/BitstreamReader.cpp b/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
index fe3f6e8b59a..60360d2ef78 100644
--- a/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
@@ -260,7 +260,10 @@ unsigned BitstreamCursor::readRecord(unsigned AbbrevID,
       break;
     }
 
-    // Otherwise, inform the streamer that we need these bytes in memory.
+    // Otherwise, inform the streamer that we need these bytes in memory.  Skip
+    // over tail padding first, in case jumping to NewEnd invalidates the Blob
+    // pointer.
+    JumpToBit(NewEnd);
     const char *Ptr = (const char *)getPointerToBit(CurBitPos, NumElts);
 
     // If we can return a reference to the data, do so to avoid copying it.
@@ -271,8 +274,6 @@ unsigned BitstreamCursor::readRecord(unsigned AbbrevID,
       for (; NumElts; --NumElts)
         Vals.push_back((unsigned char)*Ptr++);
     }
-    // Skip over tail padding.
-    JumpToBit(NewEnd);
   }
 
   return Code;
diff --git a/llvm/lib/Support/StreamingMemoryObject.cpp b/llvm/lib/Support/StreamingMemoryObject.cpp
index 5a44e624eb8..fb566179486 100644
--- a/llvm/lib/Support/StreamingMemoryObject.cpp
+++ b/llvm/lib/Support/StreamingMemoryObject.cpp
@@ -104,6 +104,12 @@ uint64_t StreamingMemoryObject::readBytes(uint8_t *Buf, uint64_t Size,
   return Size;
 }
 
+const uint8_t *StreamingMemoryObject::getPointer(uint64_t Address,
+                                                 uint64_t Size) const {
+  fetchToPos(Address + Size - 1);
+  return &Bytes[Address + BytesSkipped];
+}
+
 bool StreamingMemoryObject::dropLeadingBytes(size_t s) {
   if (BytesRead < s) return true;
   BytesSkipped = s;