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Libfuzzer: do not pass null into user function

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Differential Revision: http://reviews.llvm.org/D15098

llvm-svn: 254558
This commit is contained in:
Mike Aizatsky 2015-12-02 22:43:53 +00:00
parent 2dbef3216c
commit 2444b7e49b
2 changed files with 7 additions and 1 deletions
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6
lib/Fuzzer/FuzzerLoop.cpp
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@ -238,7 +238,11 @@ void Fuzzer::RunOneAndUpdateCorpus(Unit &U) {
} }
void Fuzzer::ExecuteCallback(const Unit &U) { void Fuzzer::ExecuteCallback(const Unit &U) {
int Res = USF.TargetFunction(U.data(), U.size()); const uint8_t *Data = U.data();
uint8_t EmptyData;
if (!Data)
Data = &EmptyData;
int Res = USF.TargetFunction(Data, U.size());
(void)Res; (void)Res;
assert(Res == 0); assert(Res == 0);
} }

2
lib/Fuzzer/test/SimpleTest.cpp
View File

@ -1,4 +1,5 @@
// Simple test for a fuzzer. The fuzzer must find the string "Hi!". // Simple test for a fuzzer. The fuzzer must find the string "Hi!".
#include <assert.h>
#include <cstdint> #include <cstdint>
#include <cstdlib> #include <cstdlib>
#include <cstddef> #include <cstddef>
@ -7,6 +8,7 @@
static volatile int Sink; static volatile int Sink;
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
assert(Data);
if (Size > 0 && Data[0] == 'H') { if (Size > 0 && Data[0] == 'H') {
Sink = 1; Sink = 1;
if (Size > 1 && Data[1] == 'i') { if (Size > 1 && Data[1] == 'i') {