ffmpeg | branch: release/4.4 | Michael Niedermayer <mich...@niedermayer.cc> | Mon Apr 19 20:23:41 2021 +0200| [c1d3a0638afbb73e5f79faf19618691cd70fb0ab] | committer: Michael Niedermayer
avformat/wtvdec: Improve size overflow checks in parse_chunks() Fixes: signed integer overflow: 32 + 2147483647 cannot be represented in type 'int Fixes: 32967/clusterfuzz-testcase-minimized-ffmpeg_dem_WTV_fuzzer-5132856218222592 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Reviewed-by: Peter Ross <pr...@xvid.org> Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> (cherry picked from commit f8ec1da8ac8e3daf2403e744f166ea9557b2d333) Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> > http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c1d3a0638afbb73e5f79faf19618691cd70fb0ab --- libavformat/wtvdec.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/libavformat/wtvdec.c b/libavformat/wtvdec.c index 4b3b7fb407..876256676c 100644 --- a/libavformat/wtvdec.c +++ b/libavformat/wtvdec.c @@ -817,7 +817,7 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p avio_skip(pb, 12); ff_get_guid(pb, &formattype); size = avio_rl32(pb); - if (size < 0 || size > INT_MAX - 92) + if (size < 0 || size > INT_MAX - 92 - consumed) return AVERROR_INVALIDDATA; parse_media_type(s, 0, sid, mediatype, subtype, formattype, size); consumed += 92 + size; @@ -833,7 +833,7 @@ static int parse_chunks(AVFormatContext *s, int mode, int64_t seekts, int *len_p avio_skip(pb, 12); ff_get_guid(pb, &formattype); size = avio_rl32(pb); - if (size < 0 || size > INT_MAX - 76) + if (size < 0 || size > INT_MAX - 76 - consumed) return AVERROR_INVALIDDATA; parse_media_type(s, s->streams[stream_index], sid, mediatype, subtype, formattype, size); consumed += 76 + size; _______________________________________________ ffmpeg-cvslog mailing list ffmpeg-cvslog@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-cvslog To unsubscribe, visit link above, or email ffmpeg-cvslog-requ...@ffmpeg.org with subject "unsubscribe".
