[PATCH 1/1] windowscodecs: Fix off-by-one check in IcoDecoder_GetFrame.

[chenzhengyong]

From: chenzhengyong

The frame index should be strictly less than idCount.
Previously, an index equal to idCount was not rejected,
leading to an out-of-range access.

Signed-off-by: chenzhengyong 
---
 dlls/windowscodecs/icoformat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dlls/windowscodecs/icoformat.c b/dlls/windowscodecs/icoformat.c
index ae2ae115e5e..c6bc79d852e 100644
--- a/dlls/windowscodecs/icoformat.c
+++ b/dlls/windowscodecs/icoformat.c
@@ -662,7 +662,7 @@ static HRESULT WINAPI IcoDecoder_GetFrame(IWICBitmapDecoder *iface,
         goto fail;
     }

-    if (This->header.idCount < index)
+    if (This->header.idCount <= index)
     {
         hr = E_INVALIDARG;
         goto fail;