Stowage/ffmpeg
2
0
Fork 0
mirror of https://git.ffmpeg.org/ffmpeg.git synced 2025-12-08 06:09:50 +00:00
Code Issues Projects Releases Packages Wiki Activity

avcodec/ac3_parser: improve false positive detection when parsing sync frames

Browse source 
A two byte sync word is not enough to ensure we got a real syncframe, nor are
all the range checks we do in the first seven bytes. Do therefore an integrity
check for the sync frame in order to prevent the parser from filling avctx with
bogus information.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2022-10-22 16:41:41 -03:00
parent ffb6918783
commit 4c35bb53f9
3 changed files with 7 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
libavcodec/ac3_parser.c
View file

@ -246,6 +246,7 @@ static av_cold int ac3_parse_init(AVCodecParserContext *s1)
{
AACAC3ParseContext *s = s1->priv_data;
s->header_size = AC3_HEADER_SIZE;
s->crc_ctx = av_crc_get_table(AV_CRC_16_ANSI);
s->sync = ac3_sync;
return 0;
}