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matroska: fix uninitialized memory accesses with ordered chapters 

There is uninitialized memory access if the actual size isn't passed
along. In the worst case, this can cause a source to be loaded against
the uninitialized memory, causing a false count of found versus required
sources, preventing the "Failed to find ordered chapter part" message.
This commit is contained in:
Ben Boeckel 2013-09-26 02:22:06 -04:00 committed by wm4
parent 696a8c5609
commit 828a952c9a
3 changed files with 3 additions and 1 deletions
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1
demux/demux.h
View File

@ -148,6 +148,7 @@ typedef struct demux_attachment
} demux_attachment_t;
struct demuxer_params {
int matroska_num_wanted_uids;
unsigned char (*matroska_wanted_uids)[16];
int matroska_wanted_segment;
bool *matroska_was_valid;

2
demux/demux_mkv.c
View File

@ -394,7 +394,7 @@ static int demux_mkv_read_info(demuxer_t *demuxer)
unsigned char (*uids)[16] = demuxer->params->matroska_wanted_uids;
if (!info.n_segment_uid)
uids = NULL;
for (int i = 0; i < MP_TALLOC_ELEMS(uids); i++) {
for (int i = 0; i < demuxer->params->matroska_num_wanted_uids; i++) {
if (!memcmp(info.segment_uid.start, uids[i], 16))
goto out;
}

1
mpvcore/timeline/tl_matroska.c
View File

@ -155,6 +155,7 @@ static bool check_file_seg(struct MPContext *mpctx, struct demuxer **sources,
{
bool was_valid = false;
struct demuxer_params params = {
.matroska_num_wanted_uids = num_sources,
.matroska_wanted_uids = uid_map,
.matroska_wanted_segment = segment,
.matroska_was_valid = &was_valid,