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avformat/dashdec: drop arbitrary DASH manifest size limit

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Currently the utilized AVBPrint API is internally limited to unsigned
integers, so if we limit the file size as well as the amount to read
to UINT_MAX - 1, we do not require additional limiting to be performed
on the values.

This change is based on the fact that initially the 8*1024 value added
in 96d70694ae was only for the case where
the file size was not known. It was not a maximum file size limit.

In 2912118898 this was reworked to be
a maximum manifest file size limit, while its commit message appears
to only note that it added support for larger manifest file sizes.

This should enable various unfortunately large MPEG-DASH manifests,
such as Youtube's multi-megabyte live stream archives to load up
as well as bring back the original intent of the logic.
This commit is contained in:
Jan Ekström 2020-09-03 19:50:08 +03:00
parent d263838958
commit 3249c757ae
1 changed files with 6 additions and 4 deletions
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10
libavformat/dashdec.c
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@ -29,7 +29,7 @@
#include "dash.h"
#define INITIAL_BUFFER_SIZE 32768
#define MAX_MANIFEST_SIZE 50 * 1024
#define MAX_BPRINT_READ_SIZE (UINT_MAX - 1)
#define DEFAULT_MANIFEST_SIZE 8 * 1024
struct fragment {
@ -1256,14 +1256,16 @@ static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
}
filesize = avio_size(in);
if (filesize > MAX_MANIFEST_SIZE) {
filesize = filesize > 0 ? filesize : DEFAULT_MANIFEST_SIZE;
if (filesize > MAX_BPRINT_READ_SIZE) {
av_log(s, AV_LOG_ERROR, "Manifest too large: %"PRId64"\n", filesize);
return AVERROR_INVALIDDATA;
}
av_bprint_init(&buf, (filesize > 0) ? filesize + 1 : DEFAULT_MANIFEST_SIZE, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_init(&buf, filesize + 1, AV_BPRINT_SIZE_UNLIMITED);
if ((ret = avio_read_to_bprint(in, &buf, MAX_MANIFEST_SIZE)) < 0 ||
if ((ret = avio_read_to_bprint(in, &buf, MAX_BPRINT_READ_SIZE)) < 0 ||
!avio_feof(in) ||
(filesize = buf.len) == 0) {
av_log(s, AV_LOG_ERROR, "Unable to read to manifest '%s'\n", url);