From 255a7b423ed5e07536bdc72e993056daa4efe009 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 19 Sep 2021 21:51:28 +0200 Subject: [PATCH] oavformat/avidec: Check offset in odml Fixes: signed integer overflow: 9223372036854775807 + 8 cannot be represented in type 'long' Fixes: 38787/clusterfuzz-testcase-minimized-ffmpeg_dem_AVI_fuzzer-4859845799444480 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/avidec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/avidec.c b/libavformat/avidec.c index b09a715d86..b10c3efa61 100644 --- a/libavformat/avidec.c +++ b/libavformat/avidec.c @@ -244,7 +244,7 @@ static int read_odml_index(AVFormatContext *s, int64_t frame_num) avio_rl32(pb); /* size */ duration = avio_rl32(pb); - if (avio_feof(pb)) + if (avio_feof(pb) || offset > INT64_MAX - 8) return AVERROR_INVALIDDATA; pos = avio_tell(pb);