Commit 406d19261c for ffmpeg

commit 406d19261cfe58279876ecacd384d14bc714425f
Author: Michael Niedermayer <michael@niedermayer.cc>
Date:   Tue Oct 6 23:20:08 2026 +0200

    avcodec/cbs_h266: Reject subpictures without slices

    Hardening for ccSUzeWGhBGj
    Found-by: Umar Pathan (Umar0x)

diff --git a/libavcodec/cbs_h266_syntax_template.c b/libavcodec/cbs_h266_syntax_template.c
index 6ad4039e1a..9e0776defe 100644
--- a/libavcodec/cbs_h266_syntax_template.c
+++ b/libavcodec/cbs_h266_syntax_template.c
@@ -2162,6 +2162,8 @@ static int FUNC(pps) (CodedBitstreamContext *ctx, RWContext *rw,
                         current->num_slices_in_subpic[i]++;
                     }
                 }
+                if (!current->num_slices_in_subpic[i])
+                    return AVERROR_INVALIDDATA;
                 num_slices += current->num_slices_in_subpic[i];
             }
             if (current->pps_num_slices_in_pic_minus1 + 1 != num_slices)