https://llvm.org/bugs/show_bug.cgi?id=25556
Bug ID: 25556
Summary: Segfault in inferPrototypeAttributes
Product: tools
Version: 3.7
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: opt
Assignee: unassignedb...@nondot.org
Reporter: pe...@trailofbits.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
opt produces a NULL-pointer dereference when trying to infer the prototype of a
declaration of __isoc99_sscanf.
If __isoc99_sscanf is declared as having only a single argument then the
following code segfaults when trying to access the parameter type of param 1.
File: llvm/lib/Transforms/IPO/FunctionAttrs.cpp
Function: inferPrototypeAttributes
1714 case LibFunc::dunder_isoc99_sscanf:
1715 if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy()
||
1716 !FTy->getParamType(1)->isPointerTy())
1717 return false;
I have ensured that my declaration of __isoc99_sscanf is attributed with
llvm::Attribute::NoBuiltin but this attribute appears to be ignored during this
inference phase. The only checked attribute is llvm::Attribute::OptimizeNone.
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