From a934766d3be63272c32f7c6a63dd52dd25501fc5 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 20 Oct 2020 21:55:13 +0200 Subject: [PATCH] avformat/lrcdec: Clip timestamps Fixes: signed integer overflow: 7111111111111531010 - -7335632962598013506 cannot be represented in type 'long' Fixes: 26463/clusterfuzz-testcase-minimized-ffmpeg_dem_LRC_fuzzer-6015558333759488 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 80bc2ac3c06319cf85428c58c471d105d25ae987) Signed-off-by: Michael Niedermayer --- libavformat/lrcdec.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavformat/lrcdec.c b/libavformat/lrcdec.c index 33f2cd90e2..db70908503 100644 --- a/libavformat/lrcdec.c +++ b/libavformat/lrcdec.c @@ -185,6 +185,8 @@ static int lrc_read_header(AVFormatContext *s) sscanf(comma_offset + 1, "%"SCNd64, &lrc->ts_offset) != 1) { av_dict_set(&s->metadata, line.str + 1, comma_offset + 1, 0); } + lrc->ts_offset = av_clip64(lrc->ts_offset, INT64_MIN/4, INT64_MAX/4); + *comma_offset = ':'; *right_bracket_offset = ']'; } @@ -198,6 +200,7 @@ static int lrc_read_header(AVFormatContext *s) while((ts_stroffset_incr = read_ts(line.str + ts_stroffset, &ts_start)) != 0) { + ts_start = av_clip64(ts_start, INT64_MIN/4, INT64_MAX/4); ts_stroffset += ts_stroffset_incr; sub = ff_subtitles_queue_insert(&lrc->q, line.str + ts_strlength, line.len - ts_strlength, 0);