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check fragment offset and size 

yes this too could have been exploitable ...

Originally committed as revision 7650 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-01-22 16:37:45 +00:00
parent ae60a85780
commit 4c71d72701
2 changed files with 10 additions and 2 deletions
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8
libavformat/asf.c
View File

@ -703,6 +703,14 @@ static int asf_read_packet(AVFormatContext *s, AVPacket *pkt)
asf->packet_size_left -= asf->packet_frag_size;
if (asf->packet_size_left < 0)
continue;
if( asf->packet_frag_offset >= asf_st->pkt.size
|| asf->packet_frag_size > asf_st->pkt.size - asf->packet_frag_offset){
av_log(s, AV_LOG_ERROR, "packet fragment position invalid %u,%u not in %u\n",
asf->packet_frag_offset, asf->packet_frag_size, asf_st->pkt.size);
continue;
}
get_buffer(pb, asf_st->pkt.data + asf->packet_frag_offset,
asf->packet_frag_size);
asf_st->frag_offset += asf->packet_frag_size;

4
libavformat/asf.h
View File

@ -106,8 +106,8 @@ typedef struct {
int packet_replic_size;
int packet_key_frame;
int packet_padsize;
int packet_frag_offset;
int packet_frag_size;
unsigned int packet_frag_offset;
unsigned int packet_frag_size;
int packet_frag_timestamp;
int packet_multi_size;
int packet_obj_size;