[FFmpeg-devel] [PR] avcodec/pdvdec: Check input space before buffer allocation (PR #21726)

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

PR #21726 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21726
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21726.patch

Fixes: Timeout
Fixes: 474457186/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PDV_fuzzer-5366108782919680

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


>From e33963ce220bf65f25377c62514de46c5180ce97 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Tue, 10 Feb 2026 20:13:07 +0100
Subject: [PATCH] avcodec/pdvdec: Check input space before buffer allocation

Fixes: Timeout
Fixes: 474457186/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PDV_fuzzer-5366108782919680

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

diff --git a/libavcodec/pdvdec.c b/libavcodec/pdvdec.c
index fffc95a530..7f41b36432 100644
--- a/libavcodec/pdvdec.c
+++ b/libavcodec/pdvdec.c
@@ -77,6 +77,9 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
         return AVERROR_INVALIDDATA;
     }
 
+    if (avpkt->size < avctx->width * avctx->height / (8*1032)) //Asymptotic max compression of deflate
+        return AVERROR_INVALIDDATA;
+
     if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
         return ret;
 
-- 
2.52.0

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