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ff_id3v2_read: add option to limit ID3 magic number search 

Several chunked formats (AIFF, IFF,DSF) store ID3 metadata within an 'ID3 '
chunk tag. If such chunks are stored sequentially, it is possible for the
ID3v2 parser to confuse the chunk tag for the ID3 magic number. e.g.

[1st chunk tag ('ID3 ') | chunk size] [ID3 magic number | metadata ...]
[2nd chunk tag ('ID3 ') | chunk size] [ID3 magic number | metadata ...]

Fixes ticket #3530.

Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Peter Ross 2014-04-18 14:49:40 +10:00 committed by Michael Niedermayer
parent c94305ae23
commit 5331773cc3
7 changed files with 22 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
libavformat/aiffdec.c
View File

@ -237,7 +237,7 @@ static int aiff_read_header(AVFormatContext *s)
break;
case MKTAG('I', 'D', '3', ' '):
position = avio_tell(pb);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, size);
if (id3v2_extra_meta)
if ((ret = ff_id3v2_parse_apic(s, &id3v2_extra_meta)) < 0) {
ff_id3v2_free_extra_meta(&id3v2_extra_meta);

2
libavformat/asfdec.c
View File

@ -268,7 +268,7 @@ static void get_id3_tag(AVFormatContext *s, int len)
{
ID3v2ExtraMeta *id3v2_extra_meta = NULL;
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, len);
if (id3v2_extra_meta)
ff_id3v2_parse_apic(s, &id3v2_extra_meta);
ff_id3v2_free_extra_meta(&id3v2_extra_meta);

2
libavformat/dsfdec.c
View File

@ -52,7 +52,7 @@ static void read_id3(AVFormatContext *s, uint64_t id3pos)
if (avio_seek(s->pb, id3pos, SEEK_SET) < 0)
return;
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
if (id3v2_extra_meta)
ff_id3v2_parse_apic(s, &id3v2_extra_meta);
ff_id3v2_free_extra_meta(&id3v2_extra_meta);

19
libavformat/id3v2.c
View File

@ -880,16 +880,25 @@ error:
static void id3v2_read_internal(AVIOContext *pb, AVDictionary **metadata,
AVFormatContext *s, const char *magic,
ID3v2ExtraMeta **extra_meta)
ID3v2ExtraMeta **extra_meta, int64_t max_search_size)
{
int len, ret;
uint8_t buf[ID3v2_HEADER_SIZE];
int found_header;
int64_t off;
int64_t start, off;
if (max_search_size && max_search_size < ID3v2_HEADER_SIZE)
return;
start = avio_tell(pb);
do {
/* save the current offset in case there's nothing to read/skip */
off = avio_tell(pb);
if (max_search_size && off - start >= max_search_size - ID3v2_HEADER_SIZE) {
avio_seek(pb, off, SEEK_SET);
break;
}
ret = avio_read(pb, buf, ID3v2_HEADER_SIZE);
if (ret != ID3v2_HEADER_SIZE) {
avio_seek(pb, off, SEEK_SET);
@ -916,13 +925,13 @@ static void id3v2_read_internal(AVIOContext *pb, AVDictionary **metadata,
void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata,
const char *magic, ID3v2ExtraMeta **extra_meta)
{
id3v2_read_internal(pb, metadata, NULL, magic, extra_meta);
id3v2_read_internal(pb, metadata, NULL, magic, extra_meta, 0);
}
void ff_id3v2_read(AVFormatContext *s, const char *magic,
ID3v2ExtraMeta **extra_meta)
ID3v2ExtraMeta **extra_meta, unsigned int max_search_size)
{
id3v2_read_internal(s->pb, &s->metadata, s, magic, extra_meta);
id3v2_read_internal(s->pb, &s->metadata, s, magic, extra_meta, max_search_size);
}
void ff_id3v2_free_extra_meta(ID3v2ExtraMeta **extra_meta)

4
libavformat/id3v2.h
View File

@ -112,8 +112,10 @@ void ff_id3v2_read_dict(AVIOContext *pb, AVDictionary **metadata, const char *ma
*
* @param extra_meta If not NULL, extra metadata is parsed into a list of
* ID3v2ExtraMeta structs and *extra_meta points to the head of the list
* @param[opt] max_search_search restrict ID3 magic number search (bytes from start)
*/
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta);
void ff_id3v2_read(AVFormatContext *s, const char *magic, ID3v2ExtraMeta **extra_meta,
unsigned int max_search_size);
/**
* Initialize an ID3v2 tag.

2
libavformat/omadec.c
View File

@ -295,7 +295,7 @@ static int oma_read_header(AVFormatContext *s)
ID3v2ExtraMeta *extra_meta = NULL;
OMAContext *oc = s->priv_data;
ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta);
ff_id3v2_read(s, ID3v2_EA3_MAGIC, &extra_meta, 0);
ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
if (ret < EA3_HEADER_SIZE)
return -1;

2
libavformat/utils.c
View File

@ -574,7 +574,7 @@ int avformat_open_input(AVFormatContext **ps, const char *filename,
/* e.g. AVFMT_NOFILE formats will not have a AVIOContext */
if (s->pb)
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta);
ff_id3v2_read(s, ID3v2_DEFAULT_MAGIC, &id3v2_extra_meta, 0);
if (!(s->flags&AVFMT_FLAG_PRIV_OPT) && s->iformat->read_header)
if ((ret = s->iformat->read_header(s)) < 0)