Student preparing for GSoC
hverbeet at gmail.com
Mon Mar 19 04:51:05 CDT 2018
On 19 March 2018 at 10:01, Kieran Duggan <kieranduggan15 at gmail.com> wrote:
> Yes that is very useful!
> I took a look at the first one I saw on the list. It goes:
> ==3551== 8 bytes in 1 blocks are definitely lost in loss record 63 of 766
> ==3551== at 0x7BC51061: notify_alloc (heap.c:254)
> ==3551== by 0x7BC5554F: RtlAllocateHeap (heap.c:1716)
> ==3551== by 0x5C85281: XAudio2Create (xaudio_dll.c:2159)
> ==3551== by 0x4A1B741: func_xaudio2 (xaudio2.c:1150)
> ==3551== by 0x4A1C74F: run_test (test.h:603)
> ==3551== by 0x4A1CBAD: main (test.h:687)
> To fix it I looked at the XAudio2Create function and noticed that
> IClassFactory *cf was assigned in the call
> make_xaudio2_factory(&IID_IClassFactory, (void**)&cf);
> which contains
> struct xaudio2_cf *ret = HeapAlloc(GetProcessHeap(), 0, sizeof(struct
> Later in the code IClassFactory_Release(cf); is used, but this wouldn't free
> up the space on the heap because of how that function is implemented.
I believe it does. Commit 45babd780f586eb8d0a93205d0998d6ce3f8396d
(which was committed after the bug report), changed
make_xaudio2_factory() to no longer return class factories with a zero
reference count. That happens sometimes.
Unfortunately, looking over the first couple of entries in the list,
it seems likely most of them are similarly already fixed. If you have
the time and inclination it would certainly be useful to go over that
list to figure out which ones are already fixed and which ones aren't,
but that would make this a bit more of a challenge than I had
intended. Sorry about that.
Still, bugzilla is not a bad place to look for things to fix. The
"download" keyword should limit searches to bugs that can be
reproduced with free downloads. We also have various small cleanup
tasks like e.g. replacing HeapAlloc() usage with the heap_alloc()
helper, or introducing usage of the ARRAY_SIZE macro. The "patches"
page  and git log may have other examples.
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