This avoids unneeded operations and makes the code faster.
Fixes: Timeout
Fixes: 15724/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PAF_VIDEO_fuzzer-5750842205929472 (12sec -> 9sec)
Fixes: 17625/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_PAF_VIDEO_fuzzer-5640515311108096 (16sec -> 4sec)
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
int current_frame;
uint8_t *frame[4];
+ int dirty[4];
int frame_size;
int video_size;
j = bytestream2_get_le16(&c->gb) + offset;
if (bytestream2_get_bytes_left(&c->gb) < (j - offset) * 16)
return AVERROR_INVALIDDATA;
+ c->dirty[page] = 1;
do {
offset++;
if (dst + 3 * c->width + 4 > dend)
c->pic->palette_has_changed = 1;
}
+ c->dirty[c->current_frame] = 1;
if (code & 0x20)
- for (i = 0; i < 4; i++)
- memset(c->frame[i], 0, c->frame_size);
+ for (i = 0; i < 4; i++) {
+ if (c->dirty[i])
+ memset(c->frame[i], 0, c->frame_size);
+ c->dirty[i] = 0;
+ }
switch (code & 0x0F) {
case 0: