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ff_id3v2_read: add option to limit ID3 magic number search

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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>
(cherry picked from commit 5331773cc3)

Conflicts:
	libavformat/dsfdec.c
	libavformat/id3v2.c
This commit is contained in:
Peter Ross
2014-04-18 14:49:40 +10:00
committed by Carl Eugen Hoyos
parent caeed48982
commit 7269ab10c5
6 changed files with 18 additions and 7 deletions
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
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@@ -266,7 +266,7 @@ 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);

13
libavformat/id3v2.c
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@@ -815,16 +815,25 @@ error:
}
void ff_id3v2_read(AVFormatContext *s, const char *magic,
ID3v2ExtraMeta **extra_meta)
ID3v2ExtraMeta **extra_meta, unsigned int 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(s->pb);
do {
/* save the current offset in case there's nothing to read/skip */
off = avio_tell(s->pb);
if (max_search_size && off - start >= max_search_size - ID3v2_HEADER_SIZE) {
avio_seek(s->pb, off, SEEK_SET);
break;
}
ret = avio_read(s->pb, buf, ID3v2_HEADER_SIZE);
if (ret != ID3v2_HEADER_SIZE) {
avio_seek(s->pb, off, SEEK_SET);

4
libavformat/id3v2.h
View File

@@ -92,8 +92,10 @@ int ff_id3v2_tag_len(const uint8_t *buf);
* Read an ID3v2 tag, including supported extra metadata
* @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
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@@ -293,7 +293,7 @@ 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

@@ -538,7 +538,7 @@ int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputForma
/* 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)