From e474173f47756f392a47d8d647cb4be398228a25 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 18 Sep 2022 14:47:25 +0200 Subject: avformat/nutdec: Check fields Fixes: signed integer overflow: -2147483648 - 1 cannot be represented in type 'int' Fixes: 50993/clusterfuzz-testcase-minimized-ffmpeg_dem_NUT_fuzzer-6566001610719232 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer (cherry picked from commit 2c146406eac06f3d3cd3d981c29e7affd834cb4d) Signed-off-by: Michael Niedermayer --- libavformat/nutdec.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c index 0b04aaad3e..7bde16be9c 100644 --- a/libavformat/nutdec.c +++ b/libavformat/nutdec.c @@ -244,6 +244,11 @@ static int decode_main_header(NUTContext *nut) for (i = 0; i < 256;) { int tmp_flags = ffio_read_varlen(bc); int tmp_fields = ffio_read_varlen(bc); + if (tmp_fields < 0) { + av_log(s, AV_LOG_ERROR, "fields %d is invalid\n", tmp_fields); + ret = AVERROR_INVALIDDATA; + goto fail; + } if (tmp_fields > 0) tmp_pts = get_s(bc); -- cgit v1.2.1