Make sure Op->getType() is a PointerType before we cast<> it.

Bug found with AFL fuzz.

llvm-svn: 236193

diff --git a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
index 7778125..456df6d 100644 (file)
--- a/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -4065,6 +4065,8 @@ std::error_code BitcodeReader::ParseFunctionBody(Function *F) {
       Type *Ty = nullptr;
       if (OpNum + 3 == Record.size())
         Ty = getTypeByID(Record[OpNum++]);
+      if (!isa<PointerType>(Op->getType()))
+        return Error("Load operand is not a pointer type");
       if (!Ty)
         Ty = cast<PointerType>(Op->getType())->getElementType();
       else if (Ty != cast<PointerType>(Op->getType())->getElementType())

diff --git a/llvm/test/Bitcode/Inputs/invalid-load-pointer-type.bc b/llvm/test/Bitcode/Inputs/invalid-load-pointer-type.bc
new file mode 100644 (file)
index 0000000..b6a56c5
Binary files /dev/null and b/llvm/test/Bitcode/Inputs/invalid-load-pointer-type.bc differ

diff --git a/llvm/test/Bitcode/invalid.test b/llvm/test/Bitcode/invalid.test
index 077f351..4aff5c0 100644 (file)
--- a/llvm/test/Bitcode/invalid.test
+++ b/llvm/test/Bitcode/invalid.test
@@ -117,3 +117,8 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-too-big-fwdref.bc 2>&1 | \
 RUN:   FileCheck --check-prefix=HUGE-FWDREF %s
 
 HUGE-FWDREF: Invalid record
+
+RUN: not llvm-dis -disable-output %p/Inputs/invalid-load-pointer-type.bc 2>&1 | \
+RUN:   FileCheck --check-prefix=LOAD-BAD-TYPE %s
+
+LOAD-BAD-TYPE: Load operand is not a pointer type