Frames that small are not valid and of limited use for error concealment, while
being very computationally intensive to process.
Fixes: Timeout
Fixes: 11168/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_WMV2_fuzzer-5733782032744448
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
}
s->dc_table_index = get_bits1(&s->gb);
+
+ // at minimum one bit per macroblock is required at least in a valid frame,
+ // we discard frames much smaller than this. Frames smaller than 1/8 of the
+ // smallest "black/skip" frame generally contain not much recoverable content
+ // while at the same time they have the highest computational requirements
+ // per byte
+ if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
+ return AVERROR_INVALIDDATA;
}
s->inter_intra_pred = 0;
s->no_rounding = 1;