[PATCH v2 1/1] dsound: Set position past the end of the buffer is invalid.

[Yuxuan Shui]

From: Yuxuan Shui

---
 dlls/dsound/buffer.c       | 11 +++++++----
 dlls/dsound/tests/dsound.c |  7 +++++++
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/dlls/dsound/buffer.c b/dlls/dsound/buffer.c
index 1b724ee775b..b1434a6d1e6 100644
--- a/dlls/dsound/buffer.c
+++ b/dlls/dsound/buffer.c
@@ -574,12 +574,15 @@ static HRESULT WINAPI IDirectSoundBufferImpl_SetCurrentPosition(IDirectSoundBuff
         IDirectSoundBufferImpl *This = impl_from_IDirectSoundBuffer8(iface);
    HRESULT hres = DS_OK;

-	TRACE("(%p,%ld)\n",This,newpos);
+	TRACE("(%p,%lu)\n",This,newpos);
+
+        if (newpos >= This->buflen) {
+            return E_INVALIDARG;
+        }

AcquireSRWLockExclusive(&This->lock);

/* start mixing from this new location instead */
-	newpos %= This->buflen;
    newpos -= newpos%This->pwfx->nBlockAlign;
    This->sec_mixpos = newpos;

@@ -1067,8 +1070,8 @@ HRESULT secondarybuffer_create(DirectSoundDevice *device, const DSBUFFERDESC *ds
    }

if (dsbd->dwBufferBytes % dsbd->lpwfxFormat->nBlockAlign)
-		dsb->buflen = dsbd->dwBufferBytes + 
-			(dsbd->lpwfxFormat->nBlockAlign - 
+		dsb->buflen = dsbd->dwBufferBytes +
+			(dsbd->lpwfxFormat->nBlockAlign -
    		(dsbd->dwBufferBytes % dsbd->lpwfxFormat->nBlockAlign));
    else
    	dsb->buflen = dsbd->dwBufferBytes;
diff --git a/dlls/dsound/tests/dsound.c b/dlls/dsound/tests/dsound.c
index d5a3ccad8fd..9656a458415 100644
--- a/dlls/dsound/tests/dsound.c
+++ b/dlls/dsound/tests/dsound.c
@@ -919,6 +919,13 @@ static HRESULT test_block_align(LPGUID lpGuid)
             rc = IDirectSoundBuffer_GetCurrentPosition(secondary, &pos2, NULL);
             ok(rc == DS_OK, "Could not get new position: %08lx\n", rc);
             ok(pos == pos2, "Positions not the same! Old position: %ld, new position: %ld\n", pos, pos2);
+
+            /* Set position to past the end of the buffer */
+            rc = IDirectSoundBuffer_SetCurrentPosition(secondary, wfx.nAvgBytesPerSec + 100);
+            ok(rc == E_INVALIDARG, "Set position to %lu succeeded\n", wfx.nAvgBytesPerSec + 100);
+            rc = IDirectSoundBuffer_GetCurrentPosition(secondary, &pos2, NULL);
+            ok(rc == DS_OK, "Could not get new position: %08lx\n", rc);
+            ok(pos == pos2, "Positions not the same! Old position: %ld, new position: %ld\n", pos, pos2);
         }
         ref=IDirectSoundBuffer_Release(secondary);
         ok(ref==0,"IDirectSoundBuffer_Release() secondary has %d references, "