https://llvm.org/bugs/show_bug.cgi?id=23650
Bug ID: 23650
Summary: raw_ostream calls memcpy() with NULL destination in
unbuffered mode
Product: libraries
Version: 3.6
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Support Libraries
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Using LLVM 3.6 and compiling with GCC 5.1 with UndefinedBehaviorSanitizer
enabled, this program:
#include <llvm/Support/raw_ostream.h>
int main()
{
llvm::errs().SetUnbuffered();
llvm::errs() << "";
}
produces
/usr/include/llvm/Support/raw_ostream.h:171:40: runtime error: null pointer
passed as argument 1, which is declared to never be null
The problematic place is here:
http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/raw_ostream.h?view=markup#l168
In unbuffered mode, OutBufCur is a null pointer, but when Size == 0, the code
still tries to call memcpy() with it.
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