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authorClément Bœsch <clement@stupeflix.com>2016-06-21 14:37:55 +0200
committerClément Bœsch <clement@stupeflix.com>2016-06-21 14:46:36 +0200
commit82439dec0fbf8a31159327ddf57096a0013109b9 (patch)
tree355f9a1be10d10385321f7c4364dc4fc90d8886d /libavformat/mpegts.c
parent0cd5e281df3f69c1ed8f2a72a5bcbf9691e1b5d5 (diff)
parent74d98d1b0e0e7af444c933ea3c472494de3ce6f2 (diff)
downloadffmpeg-82439dec0fbf8a31159327ddf57096a0013109b9.tar.gz
Merge commit '74d98d1b0e0e7af444c933ea3c472494de3ce6f2'
* commit '74d98d1b0e0e7af444c933ea3c472494de3ce6f2': mpegts: Validate the SL Packet Header Configuration See e630ca5111077fa8adc972fe8a3d7e2b3e8dc91f Our local timestamp_len > 64 is adjusted to > 63 to match the Libav check and the actual specifications (14496-1, 10.2.2). There is no need to request a sample as it violates the specifications and such a file would likely be the result of a crafted/fuzzed sample. On the other hand, the clipping of the value is kept for extra safety. Merged-by: Clément Bœsch <clement@stupeflix.com>
Diffstat (limited to 'libavformat/mpegts.c')
-rw-r--r--libavformat/mpegts.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/libavformat/mpegts.c b/libavformat/mpegts.c
index 6acb797cc1..379ffbd7bf 100644
--- a/libavformat/mpegts.c
+++ b/libavformat/mpegts.c
@@ -1406,6 +1406,14 @@ static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
if (!descr)
return AVERROR_INVALIDDATA;
+#define R8_CHECK_CLIP_MAX(dst, maxv) do { \
+ descr->sl.dst = avio_r8(&d->pb); \
+ if (descr->sl.dst > maxv) { \
+ descr->sl.dst = maxv; \
+ return AVERROR_INVALIDDATA; \
+ } \
+} while (0)
+
predefined = avio_r8(&d->pb);
if (!predefined) {
int lengths;
@@ -1418,14 +1426,9 @@ static int parse_MP4SLDescrTag(MP4DescrParseContext *d, int64_t off, int len)
descr->sl.use_idle = !!(flags & 0x02);
descr->sl.timestamp_res = avio_rb32(&d->pb);
avio_rb32(&d->pb);
- descr->sl.timestamp_len = avio_r8(&d->pb);
- if (descr->sl.timestamp_len > 64) {
- avpriv_request_sample(NULL, "timestamp_len > 64");
- descr->sl.timestamp_len = 64;
- return AVERROR_PATCHWELCOME;
- }
- descr->sl.ocr_len = avio_r8(&d->pb);
- descr->sl.au_len = avio_r8(&d->pb);
+ R8_CHECK_CLIP_MAX(timestamp_len, 63);
+ R8_CHECK_CLIP_MAX(ocr_len, 63);
+ R8_CHECK_CLIP_MAX(au_len, 31);
descr->sl.inst_bitrate_len = avio_r8(&d->pb);
lengths = avio_rb16(&d->pb);
descr->sl.degr_prior_len = lengths >> 12;