From 1ca00b5e44f21840b608e238fa135a1aab6e576b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Sun, 25 Apr 2021 20:01:03 +0200 Subject: avformat/nutdec: Check tmp_size Fixes: signed integer overflow: 2147483647 + 1 cannot be represented in type 'int' Fixes: 29102/clusterfuzz-testcase-minimized-ffmpeg_dem_NUT_fuzzer-6739990530883584 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/nutdec.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'libavformat/nutdec.c') diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c index e709257135..fc5a6a1542 100644 --- a/libavformat/nutdec.c +++ b/libavformat/nutdec.c @@ -286,6 +286,11 @@ static int decode_main_header(NUTContext *nut) ret = AVERROR_INVALIDDATA; goto fail; } + if (tmp_size < 0 || tmp_size > INT_MAX - count) { + av_log(s, AV_LOG_ERROR, "illegal size\n"); + ret = AVERROR_INVALIDDATA; + goto fail; + } for (j = 0; j < count; j++, i++) { if (i == 'N') { -- cgit v1.2.3