http://llvm.org/bugs/show_bug.cgi?id=15593
Bug ID: 15593
Summary: initializaing allocated multirank arrays causes heap
corruption
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
first an example, build and run with or without optimizations:
int main(int argc, char *argv[])
{
auto a = new int[3][2]; // ok
int s = 3; // odd numbers of s greater than 1 cause corruption
auto b = new int[s][2]{}; // corrupted
auto c = new int[4]; // crash
delete[] c; // never gets here
delete[] b; // never gets here
delete[] a; // never gets here
return 0;
}
It's is possible to "delete[] b" and delay the crash. I assume it's because the
next allocation that fits into the "b" space is ok, but the heap after "b" is
corrupt. Any "malloc" will crash if that allocation will occur after "b".
Built using gcc(4.7.2-1) and the same standard library, libstdc++6 (4.7.2-22),
doesn't crash.
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