From 2316d5ec1a95b13ff9a0ce80409fa367a041966d Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 22 Aug 2022 22:10:09 +0200
Subject: [PATCH] libavcodec/8bps: Check that line lengths fit within the
 buffer

Fixes: Timeout
Fixes: undefined pointer arithmetic
Fixes: 50330/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EIGHTBPS_fuzzer-5436287485607936

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/8bps.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/8bps.c b/libavcodec/8bps.c
index c7dfeb81ee..cda3cdef3a 100644
--- a/libavcodec/8bps.c
+++ b/libavcodec/8bps.c
@@ -68,6 +68,9 @@ static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
     unsigned char *planemap = c->planemap;
     int ret;
 
+    if (buf_size < planes * height *2)
+        return AVERROR_INVALIDDATA;
+
     if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
         return ret;