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Bug 21852 - [fuzz] Assertion `Val && "isa<> used on a null pointer"' failed.
Summary: [fuzz] Assertion `Val && "isa<> used on a null pointer"' failed.
Status: RESOLVED FIXED
Alias: None
Product: clang
Classification: Unclassified
Component: -New Bugs (show other bugs)
Version: trunk
Hardware: PC Linux
: P normal
Assignee: Unassigned Clang Bugs
URL:
Keywords:
Depends on:
Blocks: 23057
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Reported: 2014-12-10 15:55 PST by Sami Liedes
Modified: 2016-10-21 17:45 PDT (History)
3 users (show)

See Also:
Fixed By Commit(s):

Attachments
test case (63 bytes, text/x-c++src)
2014-12-10 15:55 PST, Sami Liedes 		Details
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Description Sami Liedes 2014-12-10 15:55:03 PST 
Created attachment 13493 [details]
test case

Fuzzing discovered that the attached test case, when given as input to

  clang -fno-crash-diagnostics -std=c++11 -xc++ -c -emit-llvm

causes this assertion failure:

clang-3.6: include/llvm/Support/Casting.h:95: static bool llvm::isa_impl_cl<clang::ExprWithCleanups, const clang::Expr *>::doit(const From *) [To = clang::ExprWithCleanups, From = const clang::Expr *]: Assertion `Val && "isa<> used on a null pointer"' failed.
Comment 1 David Majnemer 2014-12-10 17:28:14 PST 
reduced:
void g(int=, int);
void f() { g(0); }
Comment 2 Reid Kleckner 2016-10-21 17:45:25 PDT 
Both tests don't crash.