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avcodec/dvbsub_parser: Do not discard data

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May fix: oss fuzz issue 9220

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2018-07-06 13:02:19 +02:00
parent 4a657acaef
commit 1809f1cda9
1 changed files with 9 additions and 7 deletions
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16
libavcodec/dvbsub_parser.c
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@@ -57,6 +57,7 @@ static int dvbsub_parse(AVCodecParserContext *s,
DVBSubParseContext *pc = s->priv_data; DVBSubParseContext *pc = s->priv_data;
uint8_t *p, *p_end; uint8_t *p, *p_end;
int i, len, buf_pos = 0; int i, len, buf_pos = 0;
int out_size = 0;
ff_dlog(avctx, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n", ff_dlog(avctx, "DVB parse packet pts=%"PRIx64", lpts=%"PRIx64", cpts=%"PRIx64":\n",
s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]); s->pts, s->last_pts, s->cur_frame_pts[s->cur_frame_start_index]);
@@ -71,8 +72,8 @@ static int dvbsub_parse(AVCodecParserContext *s,
if (i % 16 != 0) if (i % 16 != 0)
ff_dlog(avctx, "\n"); ff_dlog(avctx, "\n");
*poutbuf = NULL; *poutbuf = buf;
*poutbuf_size = 0; *poutbuf_size = buf_size;
s->fetch_timestamp = 1; s->fetch_timestamp = 1;
@@ -89,7 +90,7 @@ static int dvbsub_parse(AVCodecParserContext *s,
if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) { if (buf_size < 2 || buf[0] != 0x20 || buf[1] != 0x00) {
ff_dlog(avctx, "Bad packet header\n"); ff_dlog(avctx, "Bad packet header\n");
return -1; return buf_size;
} }
buf_pos = 2; buf_pos = 2;
@@ -113,9 +114,9 @@ static int dvbsub_parse(AVCodecParserContext *s,
} }
if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE) if (buf_size - buf_pos + pc->packet_index > PARSE_BUF_SIZE)
return -1; return buf_size;
/* if not currently in a packet, discard data */ /* if not currently in a packet, pass data */
if (pc->in_packet == 0) if (pc->in_packet == 0)
return buf_size; return buf_size;
@@ -135,7 +136,7 @@ static int dvbsub_parse(AVCodecParserContext *s,
if (len + 6 <= p_end - p) if (len + 6 <= p_end - p)
{ {
*poutbuf_size += len + 6; out_size += len + 6;
p += len + 6; p += len + 6;
} else } else
@@ -159,9 +160,10 @@ static int dvbsub_parse(AVCodecParserContext *s,
} }
} }
if (*poutbuf_size > 0) if (out_size > 0)
{ {
*poutbuf = pc->packet_buf; *poutbuf = pc->packet_buf;
*poutbuf_size = out_size;
pc->packet_start = *poutbuf_size; pc->packet_start = *poutbuf_size;
} }