[FFmpeg-cvslog] avcodec/fits: Check bitpix
Michael Niedermayer
git at videolan.org
Tue May 7 01:00:47 EEST 2019
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun May 5 18:38:33 2019 +0200| [0b5c93b276a14d1990aaabd77410a562f4b242c3] | committer: Michael Niedermayer
avcodec/fits: Check bitpix
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 at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=0b5c93b276a14d1990aaabd77410a562f4b242c3
---
libavcodec/fits.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/libavcodec/fits.c b/libavcodec/fits.c
index 365347fc64..ad73ab70de 100644
--- a/libavcodec/fits.c
+++ b/libavcodec/fits.c
@@ -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;
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