Dmitry Timoshkov : windowscodecs: IWICMetadataQueryReader:: GetMetadataByName() should accept NULL for returned value.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 1593f146ec55d96b3e56b1b8688bf32fa1dd9f42
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=1593f146ec55d96b3e56b1b8688bf32fa1dd9f42

Author: Dmitry Timoshkov <dmitry at baikal.ru>
Date:   Sun Sep 16 18:01:41 2018 +0800

windowscodecs: IWICMetadataQueryReader::GetMetadataByName() should accept NULL for returned value.

Signed-off-by: Dmitry Timoshkov <dmitry at baikal.ru>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/windowscodecs/metadataquery.c  | 2 +-
 dlls/windowscodecs/tests/metadata.c | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/dlls/windowscodecs/metadataquery.c b/dlls/windowscodecs/metadataquery.c
index 2d7c918..c4c188d 100644
--- a/dlls/windowscodecs/metadataquery.c
+++ b/dlls/windowscodecs/metadataquery.c
@@ -589,7 +589,7 @@ static HRESULT WINAPI mqr_GetMetadataByName(IWICMetadataQueryReader *iface, LPCW
     PropVariantClear(&tk_id);
     PropVariantClear(&tk_schema);
 
-    if (hr == S_OK)
+    if (hr == S_OK && value)
         *value = new_value;
     else
         PropVariantClear(&new_value);
diff --git a/dlls/windowscodecs/tests/metadata.c b/dlls/windowscodecs/tests/metadata.c
index eb846db..b434648 100644
--- a/dlls/windowscodecs/tests/metadata.c
+++ b/dlls/windowscodecs/tests/metadata.c
@@ -1606,6 +1606,10 @@ static void test_metadata_gif(void)
             if (winetest_debug > 1)
                 trace("query: %s\n", decoder_data[i].query);
             MultiByteToWideChar(CP_ACP, 0, decoder_data[i].query, -1, queryW, 256);
+
+            hr = IWICMetadataQueryReader_GetMetadataByName(queryreader, queryW, NULL);
+            ok(hr == decoder_data[i].hr, "GetMetadataByName(%s) returned %#x, expected %#x\n", wine_dbgstr_w(queryW), hr, decoder_data[i].hr);
+
             PropVariantInit(&value);
             hr = IWICMetadataQueryReader_GetMetadataByName(queryreader, queryW, &value);
             ok(hr == decoder_data[i].hr, "GetMetadataByName(%s) returned %#x, expected %#x\n", wine_dbgstr_w(queryW), hr, decoder_data[i].hr);