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avcodec/fits: Check bscale

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Fixes: division by 0
Fixes: 26208/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FITS_fuzzer-6270472117026816

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 c2ccd76fd000f69e355280b487213fb63821c8aa)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-18 21:54:14 +02:00
parent f608e78016
commit 3ce851aab3
1 changed files with 2 additions and 0 deletions
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2
libavcodec/fits.c
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@ -187,6 +187,8 @@ int avpriv_fits_header_parse_line(void *avcl, FITSHeader *header, const uint8_t
header->blank = t;
header->blank_found = 1;
} else if (!strcmp(keyword, "BSCALE") && sscanf(value, "%lf", &d) == 1) {
if (d <= 0)
return AVERROR_INVALIDDATA;
header->bscale = d;
} else if (!strcmp(keyword, "BZERO") && sscanf(value, "%lf", &d) == 1) {
header->bzero = d;