[FFmpeg-devel] [PR] avcodec/leaddec: Check input data before allocating buffer (PR #21715)

[michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>]

PR #21715 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21715
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21715.patch

Fixes: Timeout
Fixes: 471636089/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LEAD_fuzzer-6346348464242688

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>


>From 138e5478da0e24ef2b6dc5d2ff4e1136ea4add2f Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Tue, 10 Feb 2026 13:56:10 +0100
Subject: [PATCH] avcodec/leaddec: Check input data before allocating buffer

Fixes: Timeout
Fixes: 471636089/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_LEAD_fuzzer-6346348464242688

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

diff --git a/libavcodec/leaddec.c b/libavcodec/leaddec.c
index e6a91faabc..e014394544 100644
--- a/libavcodec/leaddec.c
+++ b/libavcodec/leaddec.c
@@ -184,6 +184,9 @@ static int lead_decode_frame(AVCodecContext *avctx, AVFrame * frame,
     calc_dequant(dequant[0], ff_mjpeg_std_luminance_quant_tbl, q);
     calc_dequant(dequant[1], ff_mjpeg_std_chrominance_quant_tbl, q);
 
+    if (avpkt->size < ((avctx->width + 15) / 16) * ((avctx->height + 15) / 16) * 6 / 2)
+        return AVERROR_INVALIDDATA;
+
     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
         return ret;
 
-- 
2.52.0

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