From 2bf28a1edb54297f44021771b4c3d847c1f923f4 Mon Sep 17 00:00:00 2001
From: Dale Curtis <dalecurtis@chromium.org>
Date: Fri, 22 Feb 2019 15:39:25 -0800
Subject: [PATCH] Fix handling of unknown length case for matroska files.
Unknown length has a special encoding which is not uint64_t(-1).
Signed-off-by: Dale Curtis <dalecurtis@chromium.org>
---
libavformat/matroskadec.c | 13 ++++++++-----
1 file changed, 8 insertions(+), 5 deletions(-)
@@ -68,6 +68,9 @@
#include "qtpalette.h"
+// 2^56 - 1.
+#define EBML_UNKNOWN_LEN 0xffffffffffffffULL
+
typedef enum {
EBML_NONE,
EBML_UINT,
@@ -869,7 +872,7 @@ static int ebml_read_length(MatroskaDemuxContext *matroska, AVIOContext *pb,
{
int res = ebml_read_num(matroska, pb, 8, number);
if (res > 0 && *number + 1 == 1ULL << (7 * res))
- *number = 0xffffffffffffffULL;
+ *number = EBML_UNKNOWN_LEN;
return res;
}
@@ -1049,7 +1052,7 @@ static int ebml_parse_id(MatroskaDemuxContext *matroska, EbmlSyntax *syntax,
break;
if (!syntax[i].id && id == MATROSKA_ID_CLUSTER &&
matroska->num_levels > 0 &&
- matroska->levels[matroska->num_levels - 1].length == 0xffffffffffffff)
+ matroska->levels[matroska->num_levels - 1].length == EBML_UNKNOWN_LEN)
return 0; // we reached the end of an unknown size cluster
if (!syntax[i].id && id != EBML_ID_VOID && id != EBML_ID_CRC32) {
av_log(matroska->ctx, AV_LOG_DEBUG, "Unknown entry 0x%"PRIX32"\n", id);
@@ -1201,7 +1204,7 @@ static int ebml_parse_elem(MatroskaDemuxContext *matroska,
MatroskaLevel *level = &matroska->levels[matroska->num_levels - 1];
AVIOContext *pb = matroska->ctx->pb;
int64_t pos = avio_tell(pb);
- if (level->length != (uint64_t) -1 &&
+ if (level->length != EBML_UNKNOWN_LEN &&
(pos + length) > (level->start + level->length)) {
av_log(matroska->ctx, AV_LOG_ERROR,
"Invalid length 0x%"PRIx64" > 0x%"PRIx64" in parent\n",
@@ -1610,7 +1613,7 @@ static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
ret = AVERROR_INVALIDDATA;
} else {
level.start = 0;
- level.length = (uint64_t) -1;
+ level.length = EBML_UNKNOWN_LEN;
matroska->levels[matroska->num_levels] = level;
matroska->num_levels++;
matroska->current_id = 0;
@@ -1620,7 +1623,7 @@ static int matroska_parse_seekhead_entry(MatroskaDemuxContext *matroska,
/* remove dummy level */
while (matroska->num_levels) {
uint64_t length = matroska->levels[--matroska->num_levels].length;
- if (length == (uint64_t) -1)
+ if (length == EBML_UNKNOWN_LEN)
break;
}
}
--
2.21.0.rc0.258.g878e2cd30e-goog
Unknown length has a special encoding which is not uint64_t(-1). Signed-off-by: Dale Curtis <dalecurtis@chromium.org> --- libavformat/matroskadec.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)