From 538824fd844ac5fa3d018216a7fd48231a9823f6 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Tue, 10 Feb 2026 17:22:11 +0100
Subject: [PATCH] avcodec/hdrdec: Check input size before buffer allocation

Fixes: Timeout
Fixes: 471948155/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_HDR_DEC_fuzzer-5679690418552832

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/hdrdec.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/hdrdec.c b/libavcodec/hdrdec.c
index b7ade48e32..cffa7570db 100644
--- a/libavcodec/hdrdec.c
+++ b/libavcodec/hdrdec.c
@@ -126,6 +126,9 @@ static int hdr_decode_frame(AVCodecContext *avctx, AVFrame *p,
         ;
     }
 
+    if (bytestream2_get_bytes_left(&gb) < height * 4)
+        return AVERROR_INVALIDDATA;
+
     if ((ret = ff_set_dimensions(avctx, width, height)) < 0)
         return ret;