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shell32: Avoid memcmp result truncation (Coverity).

This commit is contained in:
Marcus Meissner 2012-07-07 11:52:23 +02:00 committed by Alexandre Julliard
parent a181e4dfe9
commit 0ef705fb69
1 changed files with 8 additions and 1 deletions
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9
dlls/shell32/recyclebin.c
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@ -457,12 +457,19 @@ static HRESULT WINAPI RecycleBin_BindToStorage(IShellFolder2 *This, LPCITEMIDLIS
static HRESULT WINAPI RecycleBin_CompareIDs(IShellFolder2 *iface, LPARAM lParam, LPCITEMIDLIST pidl1, LPCITEMIDLIST pidl2)
{
RecycleBin *This = impl_from_IShellFolder2(iface);
int ret;
/* TODO */
TRACE("(%p, %p, %p, %p)\n", This, (void *)lParam, pidl1, pidl2);
if (pidl1->mkid.cb != pidl2->mkid.cb)
return MAKE_HRESULT(SEVERITY_SUCCESS, 0, pidl1->mkid.cb - pidl2->mkid.cb);
return MAKE_HRESULT(SEVERITY_SUCCESS, 0, (unsigned short)memcmp(pidl1->mkid.abID, pidl2->mkid.abID, pidl1->mkid.cb));
/* Looks too complicated, but in optimized memcpy we might get
* a 32bit wide difference and would truncate it to 16 bit, so
* erroneously returning equality. */
ret = memcmp(pidl1->mkid.abID, pidl2->mkid.abID, pidl1->mkid.cb);
if (ret < 0) ret = -1;
if (ret > 0) ret = 1;
return MAKE_HRESULT(SEVERITY_SUCCESS, 0, (unsigned short)ret);
}
static HRESULT WINAPI RecycleBin_CreateViewObject(IShellFolder2 *iface, HWND hwndOwner, REFIID riid, void **ppv)