[FFmpeg-cvslog] avcodec/h264_slice: Disable slice threads if there are multiple access units in a packet
Michael Niedermayer
git at videolan.org
Sat Oct 31 22:59:13 CET 2015
ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Oct 31 21:36:00 2015 +0100| [507b01f89969601f15555f7416804fb691632cbb] | committer: Michael Niedermayer
avcodec/h264_slice: Disable slice threads if there are multiple access units in a packet
Fixes null pointer dereference
Fixes Ticket4977
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=507b01f89969601f15555f7416804fb691632cbb
---
libavcodec/h264_slice.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index 3f41e9b..eceda8a 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -1177,6 +1177,15 @@ int ff_h264_decode_slice_header(H264Context *h, H264SliceContext *sl)
av_log(h->avctx, AV_LOG_ERROR, "Too many fields\n");
return AVERROR_INVALIDDATA;
}
+ if (h->max_contexts > 1) {
+ if (!h->single_decode_warning) {
+ av_log(h->avctx, AV_LOG_WARNING, "Cannot decode multiple access units as slice threads\n");
+ h->single_decode_warning = 1;
+ }
+ h->max_contexts = 1;
+ return SLICE_SINGLETHREAD;
+ }
+
if (h->cur_pic_ptr && FIELD_PICTURE(h) && h->first_field) {
ret = ff_h264_field_end(h, h->slice_ctx, 1);
h->current_slice = 0;
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