Yuxuan Shui : dsound: Set position past the end of the buffer is invalid.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1941a915368b8898da21d0dd4157fd68a4f4c9dd
URL:    https://gitlab.winehq.org/wine/wine/-/commit/1941a915368b8898da21d0dd4157fd6...

Author: Yuxuan Shui <yshui(a)codeweavers.com>
Date:   Thu Dec  7 19:55:20 2023 +0000

dsound: Set position past the end of the buffer is invalid.

---

 dlls/dsound/buffer.c       | 7 +++++--
 dlls/dsound/tests/dsound.c | 7 +++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/dlls/dsound/buffer.c b/dlls/dsound/buffer.c
index 1b724ee775b..8e261fde32c 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;
 
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, "