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avformat/sccenc: avoid potential invalid access 

Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2022-04-10 22:20:04 +08:00
parent 4607868b98
commit 8e828ee1ad
1 changed files with 2 additions and 2 deletions
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4
libavformat/sccenc.c
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@ -72,11 +72,11 @@ static int scc_write_packet(AVFormatContext *avf, AVPacket *pkt)
s = (int)(pts / 1000) % 60;
f = (int)(pts % 1000) / 33;
for (i = 0; i < pkt->size; i+=3) {
for (i = 0; i < pkt->size - 2; i+=3) {
if (pkt->data[i] == 0xfc && ((pkt->data[i + 1] != 0x80 || pkt->data[i + 2] != 0x80)))
break;
}
if (i >= pkt->size)
if (i >= pkt->size - 2)
return 0;
if (!scc->inside && (scc->prev_h != h || scc->prev_m != m || scc->prev_s != s || scc->prev_f != f)) {