From: Filipe Cabecinhas <me@filcab.net>
Date: Wed, 22 Apr 2015 09:06:21 +0000 (+0000)
Subject: Have more strict type checks when creating BinOp nodes in BitcodeReader
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=e16cac587a3ad788fd3d87601ba824202b1a3803;p=llvm

Have more strict type checks when creating BinOp nodes in BitcodeReader

Summary: Bug found with AFL.

Reviewers: rafael, bkramer

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D9015

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235489 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Bitcode/Reader/BitcodeReader.cpp b/lib/Bitcode/Reader/BitcodeReader.cpp
index 77d4c6261fb..a16be24a5b5 100644
--- a/lib/Bitcode/Reader/BitcodeReader.cpp
+++ b/lib/Bitcode/Reader/BitcodeReader.cpp
@@ -607,27 +607,42 @@ static int GetDecodedCastOpcode(unsigned Val) {
   case bitc::CAST_ADDRSPACECAST: return Instruction::AddrSpaceCast;
   }
 }
+
 static int GetDecodedBinaryOpcode(unsigned Val, Type *Ty) {
+  bool IsFP = Ty->isFPOrFPVectorTy();
+  // BinOps are only valid for int/fp or vector of int/fp types
+  if (!IsFP && !Ty->isIntOrIntVectorTy())
+    return -1;
+
   switch (Val) {
-  default: return -1;
+  default:
+    return -1;
   case bitc::BINOP_ADD:
-    return Ty->isFPOrFPVectorTy() ? Instruction::FAdd : Instruction::Add;
+    return IsFP ? Instruction::FAdd : Instruction::Add;
   case bitc::BINOP_SUB:
-    return Ty->isFPOrFPVectorTy() ? Instruction::FSub : Instruction::Sub;
+    return IsFP ? Instruction::FSub : Instruction::Sub;
   case bitc::BINOP_MUL:
-    return Ty->isFPOrFPVectorTy() ? Instruction::FMul : Instruction::Mul;
-  case bitc::BINOP_UDIV: return Instruction::UDiv;
+    return IsFP ? Instruction::FMul : Instruction::Mul;
+  case bitc::BINOP_UDIV:
+    return IsFP ? -1 : Instruction::UDiv;
   case bitc::BINOP_SDIV:
-    return Ty->isFPOrFPVectorTy() ? Instruction::FDiv : Instruction::SDiv;
-  case bitc::BINOP_UREM: return Instruction::URem;
+    return IsFP ? Instruction::FDiv : Instruction::SDiv;
+  case bitc::BINOP_UREM:
+    return IsFP ? -1 : Instruction::URem;
   case bitc::BINOP_SREM:
-    return Ty->isFPOrFPVectorTy() ? Instruction::FRem : Instruction::SRem;
-  case bitc::BINOP_SHL:  return Instruction::Shl;
-  case bitc::BINOP_LSHR: return Instruction::LShr;
-  case bitc::BINOP_ASHR: return Instruction::AShr;
-  case bitc::BINOP_AND:  return Instruction::And;
-  case bitc::BINOP_OR:   return Instruction::Or;
-  case bitc::BINOP_XOR:  return Instruction::Xor;
+    return IsFP ? Instruction::FRem : Instruction::SRem;
+  case bitc::BINOP_SHL:
+    return IsFP ? -1 : Instruction::Shl;
+  case bitc::BINOP_LSHR:
+    return IsFP ? -1 : Instruction::LShr;
+  case bitc::BINOP_ASHR:
+    return IsFP ? -1 : Instruction::AShr;
+  case bitc::BINOP_AND:
+    return IsFP ? -1 : Instruction::And;
+  case bitc::BINOP_OR:
+    return IsFP ? -1 : Instruction::Or;
+  case bitc::BINOP_XOR:
+    return IsFP ? -1 : Instruction::Xor;
   }
 }
 
diff --git a/test/Bitcode/Inputs/invalid-fp-shift.bc b/test/Bitcode/Inputs/invalid-fp-shift.bc
new file mode 100644
index 00000000000..aeba1bff968
Binary files /dev/null and b/test/Bitcode/Inputs/invalid-fp-shift.bc differ
diff --git a/test/Bitcode/invalid.test b/test/Bitcode/invalid.test
index 5c6e280024c..5431368a0ad 100644
--- a/test/Bitcode/invalid.test
+++ b/test/Bitcode/invalid.test
@@ -61,3 +61,8 @@ RUN: not llvm-dis -disable-output %p/Inputs/invalid-no-proper-module.bc 2>&1 | \
 RUN:   FileCheck --check-prefix=NO-MODULE %s
 
 NO-MODULE: Malformed IR file
+
+RUN: not llvm-dis -disable-output %p/Inputs/invalid-fp-shift.bc 2>&1 | \
+RUN:   FileCheck --check-prefix=FP-SHIFT %s
+
+FP-SHIFT: Invalid record