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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 <michael@niedermayer.cc>
(cherry picked from commit 1ca00b5e44)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-04-25 20:01:03 +02:00
parent 2b11977c9e
commit 2c9e43e7f8
1 changed files with 5 additions and 0 deletions
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5
libavformat/nutdec.c
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@ -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') {