commit 79dcc274b4c5334389b629a75d915cf954995b15
author Michael Kuperstein <mkuper@google.com> Tue Sep 20 23:10:31 2016 +0000
committer Michael Kuperstein <mkuper@google.com> Tue Sep 20 23:10:31 2016 +0000
tree a2d6fc93f59d78588451b95c5e078872cac6ae12
parent 620c140a9b50b715296f2e1412834aac151bb440

[InferAttributes] Don't access parameters that don't exist.

Check for the correct number of parameters before querying their type.
This fixes PR30455.

llvm-svn: 282038

llvm/lib/Analysis/TargetLibraryInfo.cpp

diff --git a/llvm/lib/Analysis/TargetLibraryInfo.cpp b/llvm/lib/Analysis/TargetLibraryInfo.cpp
index 2a47390..98f2321 100644
--- a/llvm/lib/Analysis/TargetLibraryInfo.cpp
+++ b/llvm/lib/Analysis/TargetLibraryInfo.cpp
@@ -847,10 +847,10 @@
   case LibFunc::stat64:
   case LibFunc::lstat64:
   case LibFunc::statvfs64:
-    return (NumParams >= 1 && FTy.getParamType(0)->isPointerTy() &&
+    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy() &&
             FTy.getParamType(1)->isPointerTy());
   case LibFunc::dunder_isoc99_sscanf:
-    return (NumParams >= 1 && FTy.getParamType(0)->isPointerTy() &&
+    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
             FTy.getParamType(1)->isPointerTy());
   case LibFunc::fopen64:
     return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&