https://llvm.org/bugs/show_bug.cgi?id=27915
Bug ID: 27915
Summary: strstreambuf::overflow passes wrong value to setp
Product: libc++
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
strstreambuf::overflow allocates a new memory block when the current character
pointer reaches the end pointer (when pptr() == epptr()) and then repositions
the pointers that define the put area calling setp.
setp(buf + einp, buf + einp + eout);
This code is incorrect since the third argument should be a value of a pointer
that points to the end of the put area. This bug causes ASAN to report an error
when the following program is compiled and run:
$ cat test.c
#include <iostream>
#include <string>
#include <strstream>
int main(int, char const **argv) {
std::ostrstream oss;
std::string s;
for (int i = 0; i < 4096; ++i)
s.push_back((i % 16) + 'a');
oss << s << std::ends;
std::cout << oss.str();
oss.freeze(false);
return 0;
}
A patch to fix this bug has been submitted here:
http://reviews.llvm.org/D20334
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