[FFmpeg-cvslog] avcodec/d3d12va_encode: fix l0 reference count limit

[Araz Iusubov]

ffmpeg | branch: master | Araz Iusubov <primeadvice at gmail.com> | Wed Jun  4 10:36:34 2025 +0200| [49e52ca24ff93702188375c058c20e7db4ff0cb5] | committer: Tong Wu

avcodec/d3d12va_encode: fix l0 reference count limit

Prevents potential null pointer dereference when querying
MaxL1ReferencesForB from codec-specific support structures
during GOP structure initialization.

Signed-off-by: Tong Wu <wutong1208 at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=49e52ca24ff93702188375c058c20e7db4ff0cb5
---

 libavcodec/d3d12va_encode.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavcodec/d3d12va_encode.c b/libavcodec/d3d12va_encode.c
index 4d738200fe..e24a5b8d24 100644
--- a/libavcodec/d3d12va_encode.c
+++ b/libavcodec/d3d12va_encode.c
@@ -1088,13 +1088,15 @@ static int d3d12va_encode_init_gop_structure(AVCodecContext *avctx)
         switch (ctx->codec->d3d12_codec) {
             case D3D12_VIDEO_ENCODER_CODEC_H264:
                 ref_l0 = FFMIN(support.PictureSupport.pH264Support->MaxL0ReferencesForP,
-                               support.PictureSupport.pH264Support->MaxL1ReferencesForB);
+                               support.PictureSupport.pH264Support->MaxL1ReferencesForB ?
+                               support.PictureSupport.pH264Support->MaxL1ReferencesForB : UINT_MAX);
                 ref_l1 = support.PictureSupport.pH264Support->MaxL1ReferencesForB;
                 break;
 
             case D3D12_VIDEO_ENCODER_CODEC_HEVC:
                 ref_l0 = FFMIN(support.PictureSupport.pHEVCSupport->MaxL0ReferencesForP,
-                               support.PictureSupport.pHEVCSupport->MaxL1ReferencesForB);
+                               support.PictureSupport.pHEVCSupport->MaxL1ReferencesForB ?
+                               support.PictureSupport.pHEVCSupport->MaxL1ReferencesForB : UINT_MAX);
                 ref_l1 = support.PictureSupport.pHEVCSupport->MaxL1ReferencesForB;
                 break;