From patchwork Mon Mar 16 08:26:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anton Khirnov X-Patchwork-Id: 18237 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id 036DB448B9C for ; Mon, 16 Mar 2020 10:26:50 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id D6D8D68B1BD; Mon, 16 Mar 2020 10:26:49 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from mail.red.khirnov.net (red.khirnov.net [176.97.15.12]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 3BFC268B14F for ; Mon, 16 Mar 2020 10:26:44 +0200 (EET) Received: from localhost (localhost [IPv6:::1]) by mail.red.khirnov.net (Postfix) with ESMTP id 02875283E51 for ; Mon, 16 Mar 2020 09:26:44 +0100 (CET) Received: from mail.red.khirnov.net ([IPv6:::1]) by localhost (mail.red.khirnov.net [IPv6:::1]) (amavisd-new, port 10024) with ESMTP id nvR6cERVilLu for ; Mon, 16 Mar 2020 09:26:43 +0100 (CET) Received: from quelana.khirnov.net (unknown [IPv6:2a00:c500:61:23b::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) client-signature RSA-PSS (2048 bits)) (Client CN "quelana.khirnov.net", Issuer "smtp.khirnov.net SMTP CA" (verified OK)) by mail.red.khirnov.net (Postfix) with ESMTPS id 78711283E48 for ; Mon, 16 Mar 2020 09:26:43 +0100 (CET) Received: from localhost (quelana.khirnov.net [IPv6:::1]) by quelana.khirnov.net (Postfix) with ESMTP id C5264253B5 for ; Mon, 16 Mar 2020 09:26:41 +0100 (CET) Received: from quelana.khirnov.net ([IPv6:::1]) by localhost (quelana.khirnov.net [IPv6:::1]) (amavisd-new, port 10024) with ESMTP id G3TgDpdFRvBz for ; Mon, 16 Mar 2020 09:26:40 +0100 (CET) Received: from libav.daenerys.khirnov.net (libav.daenerys.khirnov.net [IPv6:2a00:c500:561:201::7]) by quelana.khirnov.net (Postfix) with ESMTP id CC8AF25301 for ; Mon, 16 Mar 2020 09:26:40 +0100 (CET) Received: by libav.daenerys.khirnov.net (Postfix, from userid 1000) id 87EF920E0353; Mon, 16 Mar 2020 09:26:39 +0100 (CET) From: Anton Khirnov To: ffmpeg-devel@ffmpeg.org Date: Mon, 16 Mar 2020 09:26:21 +0100 Message-Id: <20200316082621.10901-1-anton@khirnov.net> X-Mailer: git-send-email 2.24.1 In-Reply-To: <5fda9445-01fb-a2ae-7a78-2d015b868da7@gmail.com> References: <5fda9445-01fb-a2ae-7a78-2d015b868da7@gmail.com> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH] mpeg4videodec: do not copy a range of fields at once X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" This is extremely fragile against reordering and hides what is actually being copied. Copy all the fields manually instead. --- Like this? --- libavcodec/mpeg4videodec.c | 28 +++++++++++++++++++++++++++- 1 file changed, 27 insertions(+), 1 deletion(-) diff --git a/libavcodec/mpeg4videodec.c b/libavcodec/mpeg4videodec.c index cc03486646..b57bfca943 100644 --- a/libavcodec/mpeg4videodec.c +++ b/libavcodec/mpeg4videodec.c @@ -3460,7 +3460,33 @@ static int mpeg4_update_thread_context(AVCodecContext *dst, if (ret < 0) return ret; - memcpy(((uint8_t*)s) + sizeof(MpegEncContext), ((uint8_t*)s1) + sizeof(MpegEncContext), sizeof(Mpeg4DecContext) - sizeof(MpegEncContext)); + // copy all the necessary fields explicitly + s->time_increment_bits = s1->time_increment_bits; + s->shape = s1->shape; + s->vol_sprite_usage = s1->vol_sprite_usage; + s->sprite_brightness_change = s1->sprite_brightness_change; + s->num_sprite_warping_points = s1->num_sprite_warping_points; + s->rvlc = s1->rvlc; + s->resync_marker = s1->resync_marker; + s->t_frame = s1->t_frame; + s->new_pred = s1->new_pred; + s->enhancement_type = s1->enhancement_type; + s->scalability = s1->scalability; + s->use_intra_dc_vlc = s1->use_intra_dc_vlc; + s->intra_dc_threshold = s1->intra_dc_threshold; + s->divx_version = s1->divx_version; + s->divx_build = s1->divx_build; + s->xvid_build = s1->xvid_build; + s->lavc_build = s1->lavc_build; + s->showed_packed_warning = s1->showed_packed_warning; + s->vol_control_parameters = s1->vol_control_parameters; + s->cplx_estimation_trash_i = s1->cplx_estimation_trash_i; + s->cplx_estimation_trash_p = s1->cplx_estimation_trash_p; + s->cplx_estimation_trash_b = s1->cplx_estimation_trash_b; + s->rgb = s1->rgb; + + memcpy(s->sprite_shift, s1->sprite_shift, sizeof(s1->sprite_shift)); + memcpy(s->sprite_traj, s1->sprite_traj, sizeof(s1->sprite_traj)); if (CONFIG_MPEG4_DECODER && !init && s1->xvid_build >= 0) ff_xvid_idct_init(&s->m.idsp, dst);