From d973fcbcc2f944752ff10e6a76b0b2d9329937a7 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sat, 30 Sep 2023 00:38:17 +0200
Subject: [PATCH] avformat/cafdec: dont seek beyond 64bit

Fixes: signed integer overflow: 64 + 9223372036854775807 cannot be represented in type 'long long'
Fixes: 51896/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-6418242730328064
Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_CAF_fuzzer-6418242730328064

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/cafdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/cafdec.c b/libavformat/cafdec.c
index 8622859..f5c62a8 100644
--- a/libavformat/cafdec.c
+++ b/libavformat/cafdec.c
@@ -209,7 +209,7 @@ static int read_pakt_chunk(AVFormatContext *s, int64_t size)
         st->duration += caf->frames_per_packet ? caf->frames_per_packet : ff_mp4_read_descr_len(pb);
     }
 
-    if (avio_tell(pb) - ccount > size) {
+    if (avio_tell(pb) - ccount > size || size > INT64_MAX - ccount) {
         av_log(s, AV_LOG_ERROR, "error reading packet table\n");
         return AVERROR_INVALIDDATA;
     }
-- 
2.43.0

