https://llvm.org/bugs/show_bug.cgi?id=31061
Bug ID: 31061
Summary: ASan failed to catch overrelease of block using
Block_release
Product: compiler-rt
Version: unspecified
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: normal
Priority: P
Component: compiler-rt
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Blocks, enabled by -fblocks, are a reference-counted data type once copied to
the heap using Block_copy; when compiling for Objective-C on Apple platforms
they are also valid Objective-C objects that respond to -copy, -retain, and
-release. ASan fails to catch the overrelease of a simple block copied to the
heap, as demonstrated by the following code.
---
// clang -fsanitize=address -fblocks
#include <stdio.h>
#include <Block.h>
int main(int argc, const char *argv[]) {
__typeof(^{}) block = ^{ printf("%d\n", argc); };
block = Block_copy(block);
block();
Block_release(block);
Block_release(block); // overrelease
// Note that the -release message and Block_release are interchangeable for
blocks.
}
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