Fixes: signed integer overflow: 8 * 340018243 cannot be represented in type 'int' Fixes: 9441/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DIRAC_fuzzer-5194665207791616
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc> --- libavcodec/diracdec.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libavcodec/diracdec.c b/libavcodec/diracdec.c index b27c743c58..9a417caec5 100644 --- a/libavcodec/diracdec.c +++ b/libavcodec/diracdec.c @@ -986,6 +986,10 @@ static int decode_lowdelay(DiracContext *s) for (slice_x = 0; bufsize > 0 && slice_x < s->num_x; slice_x++) { bytes = (slice_num+1) * (int64_t)s->lowdelay.bytes.num / s->lowdelay.bytes.den - slice_num * (int64_t)s->lowdelay.bytes.num / s->lowdelay.bytes.den; + if (bytes >= INT_MAX || bytes*8 > bufsize) { + av_log(s->avctx, AV_LOG_ERROR, "too many bytes\n"); + return AVERROR_INVALIDDATA; + } slices[slice_num].bytes = bytes; slices[slice_num].slice_x = slice_x; slices[slice_num].slice_y = slice_y; -- 2.18.0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
