From 050b5e85cbe61414ba9b78f76a04b2488e816f42 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 22 Sep 2024 20:31:58 +0200
Subject: [PATCH] avcodec/svq3: Check for minimum size input

Fixes: Timeout
Fixes: 71295/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_SVQ3_fuzzer-4999941125111808

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/svq3.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/svq3.c b/libavcodec/svq3.c
index ce4c58e14f..f730358e2f 100644
--- a/libavcodec/svq3.c
+++ b/libavcodec/svq3.c
@@ -1400,6 +1400,9 @@ static int svq3_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
     if (svq3_decode_slice_header(avctx))
         return -1;
 
+    if (avpkt->size < s->mb_width * s->mb_height / 8)
+        return AVERROR_INVALIDDATA;
+
     s->pict_type = s->slice_type;
 
     if (s->pict_type != AV_PICTURE_TYPE_B)