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avformat/nutdec: Fix integer overflow in count computation

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Note, the value is checked a few lines later already

Fixes: signed integer overflow: -440402016 - 1879048064 cannot be represented in type 'int'
Fixes: 26910/clusterfuzz-testcase-minimized-ffmpeg_dem_NUT_fuzzer-6603876618469376

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-16 22:44:33 +01:00
parent 48fb752767
commit 0014249fd9
1 changed files with 1 additions and 1 deletions
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libavformat/nutdec.c
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@ -260,7 +260,7 @@ static int decode_main_header(NUTContext *nut)
if (tmp_fields > 5) if (tmp_fields > 5)
count = ffio_read_varlen(bc); count = ffio_read_varlen(bc);
else else
count = tmp_mul - tmp_size; count = tmp_mul - (unsigned)tmp_size;
if (tmp_fields > 6) if (tmp_fields > 6)
get_s(bc); get_s(bc);
if (tmp_fields > 7) if (tmp_fields > 7)