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avcodec/fits: Check bitpix

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Reference: Table 8: Interpretation of valid BITPIX value from FITS standard 4.0
Fixes: runtime error: division by zero
Fixes: 14581/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FITS_fuzzer-5652382425284608

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 0b5c93b276)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-05-05 18:38:33 +02:00
parent cc5257aa27
commit ae1c6169b6
1 changed files with 11 additions and 0 deletions
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11
libavcodec/fits.c
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@ -138,6 +138,17 @@ int avpriv_fits_header_parse_line(void *avcl, FITSHeader *header, const uint8_t
case STATE_BITPIX:
CHECK_KEYWORD("BITPIX");
CHECK_VALUE("BITPIX", bitpix);
switch(header->bitpix) {
case 8:
case 16:
case 32: case -32:
case 64: case -64: break;
default:
av_log(avcl, AV_LOG_ERROR, "invalid value of BITPIX %d\n", header->bitpix); \
return AVERROR_INVALIDDATA;
}
dict_set_if_not_null(metadata, keyword, value);
header->state = STATE_NAXIS;