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lavf/dashdec: support larger manifests

This commit is contained in:
rcombs 2020-05-02 01:33:13 -05:00
parent 648051f07c
commit 2912118898
1 changed files with 15 additions and 14 deletions
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27
libavformat/dashdec.c
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@ -29,6 +29,8 @@
#include "dash.h"
#define INITIAL_BUFFER_SIZE 32768
#define MAX_MANIFEST_SIZE 50 * 1024
#define DEFAULT_MANIFEST_SIZE 8 * 1024
struct fragment {
int64_t url_offset;
@ -1220,7 +1222,7 @@ static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
int close_in = 0;
uint8_t *new_url = NULL;
int64_t filesize = 0;
char *buffer = NULL;
AVBPrint buf;
AVDictionary *opts = NULL;
xmlDoc *doc = NULL;
xmlNodePtr root_element = NULL;
@ -1254,24 +1256,23 @@ static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
}
filesize = avio_size(in);
if (filesize <= 0) {
filesize = 8 * 1024;
if (filesize > MAX_MANIFEST_SIZE) {
av_log(s, AV_LOG_ERROR, "Manifest too large: %"PRId64"\n", filesize);
return AVERROR_INVALIDDATA;
}
buffer = av_mallocz(filesize);
if (!buffer) {
av_free(c->base_url);
return AVERROR(ENOMEM);
}
av_bprint_init(&buf, (filesize > 0) ? filesize + 1 : DEFAULT_MANIFEST_SIZE, AV_BPRINT_SIZE_UNLIMITED);
filesize = avio_read(in, buffer, filesize);
if (filesize <= 0) {
av_log(s, AV_LOG_ERROR, "Unable to read to offset '%s'\n", url);
if ((ret = avio_read_to_bprint(in, &buf, MAX_MANIFEST_SIZE)) < 0 ||
!avio_feof(in) ||
(filesize = buf.len) == 0) {
av_log(s, AV_LOG_ERROR, "Unable to read to manifest '%s'\n", url);
if (ret == 0)
ret = AVERROR_INVALIDDATA;
} else {
LIBXML_TEST_VERSION
doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
doc = xmlReadMemory(buf.str, filesize, c->base_url, NULL, 0);
root_element = xmlDocGetRootElement(doc);
node = root_element;
@ -1394,7 +1395,7 @@ cleanup:
}
av_free(new_url);
av_free(buffer);
av_bprint_finalize(&buf, NULL);
if (close_in) {
avio_close(in);
}