If the bitcode reader input stream isn't a multiple of 4 bytes, it's more
likely not a bitcode file at all, rather than being a bitcode file which
is truncated. Check for this case and issue a more relevant error message.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100156 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
index b9453c9..76d112e 100644
--- a/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -1527,12 +1527,16 @@
bool BitcodeReader::ParseBitcodeInto(Module *M) {
TheModule = 0;
- if (Buffer->getBufferSize() & 3)
- return Error("Bitcode stream should be a multiple of 4 bytes in length");
-
unsigned char *BufPtr = (unsigned char *)Buffer->getBufferStart();
unsigned char *BufEnd = BufPtr+Buffer->getBufferSize();
+ if (Buffer->getBufferSize() & 3) {
+ if (!isRawBitcode(BufPtr, BufEnd) && !isBitcodeWrapper(BufPtr, BufEnd))
+ return Error("Invalid bitcode signature");
+ else
+ return Error("Bitcode stream should be a multiple of 4 bytes in length");
+ }
+
// If we have a wrapper header, parse it and ignore the non-bc file contents.
// The magic number is 0x0B17C0DE stored in little endian.
if (isBitcodeWrapper(BufPtr, BufEnd))