[PR] avcodec/ffv1dec: reject a remap that produces zero entries (PR #23906)

PR #23906 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23906
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/23906.patch


>From 53243118dce056f36c5ff678604da9c75f967bd5 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <[email protected]>
Date: Sat, 25 Jul 2026 04:31:38 +0200
Subject: [PATCH] avcodec/ffv1dec: reject a remap that produces zero entries

---
 libavcodec/ffv1dec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/ffv1dec.c b/libavcodec/ffv1dec.c
index ba973ab76f..f972c41ec4 100644
--- a/libavcodec/ffv1dec.c
+++ b/libavcodec/ffv1dec.c
@@ -369,6 +369,8 @@ static int decode_remap(FFV1Context *f, FFV1SliceContext *sc)
             }
             lu ^= !run;
         }
+        if (!j)
+            return AVERROR_INVALIDDATA;
         sc->remap_count[p] = j;
     }
     return 0;
-- 
2.52.0

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