[PATCH 0/1] MR4233: winmm: Fix pszSound allocation in PlaySound_Alloc().

[Paul Gofman (＠gofman)]

In general, ucrtbase allocation are used here (and later ucrtbase.free for freeing memory). RtlCreateUnicodeStringFromAsciiz() is using RtlAllocateHeap(GetProcessHeap(),...) for allocation. Using ucrtbase.free() may results in freeing from a different heap which leaks the string as best or aborts the program when heap validation is enabled.

[PATCH 1/1] winmm: Fix pszSound allocation in PlaySound_Alloc().

[Paul Gofman]

From: Paul Gofman

---
 dlls/winmm/playsound.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/dlls/winmm/playsound.c b/dlls/winmm/playsound.c
index 2ba2ad1e8dc..1183a72aa7c 100644
--- a/dlls/winmm/playsound.c
+++ b/dlls/winmm/playsound.c
@@ -231,8 +231,9 @@ static WINE_PLAYSOUND*  PlaySound_Alloc(const void* pszSound, HMODULE hmod,
         else
         {
             UNICODE_STRING usBuffer;
-            RtlCreateUnicodeStringFromAsciiz(&usBuffer, pszSound);
-            wps->pszSound = usBuffer.Buffer;
+            if (!RtlCreateUnicodeStringFromAsciiz(&usBuffer, pszSound)) goto oom_error;
+            wps->pszSound = wcsdup(usBuffer.Buffer);
+            HeapFree(GetProcessHeap(), 0, usBuffer.Buffer);
             if (!wps->pszSound) goto oom_error;
             wps->bAlloc = TRUE;
         }