From c4b2017ba66e1623da9f527704c61c86a6e74844 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 7 Apr 2015 02:47:36 +0200 Subject: [PATCH] avcodec/h264: finish previous slices before switching to single thread mode Fixes null pointer dereference Fixes Ticket4438 Signed-off-by: Michael Niedermayer --- libavcodec/h264.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libavcodec/h264.c b/libavcodec/h264.c index 5dd187d2b5..b4c4cd96c9 100644 --- a/libavcodec/h264.c +++ b/libavcodec/h264.c @@ -1674,6 +1674,12 @@ again: av_log(h->avctx, AV_LOG_ERROR, "decode_slice_header error\n"); sl->ref_count[0] = sl->ref_count[1] = sl->list_count = 0; } else if (err == SLICE_SINGLETHREAD) { + if (context_count > 1) { + ret = ff_h264_execute_decode_slices(h, context_count - 1); + if (ret < 0 && (h->avctx->err_recognition & AV_EF_EXPLODE)) + goto end; + context_count = 0; + } /* Slice could not be decoded in parallel mode, restart. Note * that rbsp_buffer is not transferred, but since we no longer * run in parallel mode this should not be an issue. */