From 946272b79a325e9bce613b260e50e4e4fe7f3159 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Thu, 30 Jul 2026 01:41:17 +0200
Subject: [PATCH] avcodec/vulkan/ffv1_dec_setup: bound the fltmap write

---
 libavcodec/vulkan/ffv1_dec_setup.comp.glsl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/vulkan/ffv1_dec_setup.comp.glsl b/libavcodec/vulkan/ffv1_dec_setup.comp.glsl
index ead7c57474..ea84da6d4e 100644
--- a/libavcodec/vulkan/ffv1_dec_setup.comp.glsl
+++ b/libavcodec/vulkan/ffv1_dec_setup.comp.glsl
@@ -135,6 +135,8 @@ bool decode_remap(uint slice_idx, inout SliceContext sc)
                 }
                 if (i - 1 >= int64_t(end))
                     break;
+                if (j >= fltmap[slice_idx][p].length())
+                    return true;
                 uint iv = uint(i);
                 fltmap[slice_idx][p][j++] = iv ^ (((iv & flip_mask) != 0u) ? 0u : flip);
                 i++;