From patchwork Sat Dec 7 23:20:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 16665 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 48B1B4491B7 for ; Sun, 8 Dec 2019 01:23:18 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 27AED68B59B; Sun, 8 Dec 2019 01:23:18 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe01-1.mx.upcmail.net (vie01a-dmta-pe01-1.mx.upcmail.net [62.179.121.154]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id 09F5368B4F2 for ; Sun, 8 Dec 2019 01:23:12 +0200 (EET) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe01.mx.upcmail.net with esmtp (Exim 4.92) (envelope-from ) id 1idjPr-0005Q7-0n for ffmpeg-devel@ffmpeg.org; Sun, 08 Dec 2019 00:23:11 +0100 Received: from localhost ([213.47.68.29]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id djOsigcJHwlysdjOsitNsY; Sun, 08 Dec 2019 00:22:10 +0100 X-Env-Mailfrom: michael@niedermayer.cc X-Env-Rcptto: ffmpeg-devel@ffmpeg.org X-SourceIP: 213.47.68.29 X-CNFS-Analysis: v=2.3 cv=E5OzWpVl c=1 sm=1 tr=0 a=2hcxjKEKjp0CzLx6oWAm4g==:117 a=2hcxjKEKjp0CzLx6oWAm4g==:17 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=nZOtpAppAAAA:20 a=pe8-g0Vb6r4bvhH_3GAA:9 a=1fhp2MxaeJtTNGEnv6mo:22 a=Z5ABNNGmrOfJ6cZ5bIyy:22 a=jd6J4Gguk5HxikPWLKER:22 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Sun, 8 Dec 2019 00:20:09 +0100 Message-Id: <20191207232012.29634-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.23.0 MIME-Version: 1.0 X-CMAE-Envelope: MS4wfNPf5++zjon3K+ltTvQw0vJWY1b7MuNHmYoUu/6srZ3ZZc+DoojF37rvpUrXmqxta2WTovj1Tffnq7bFCrwycrTpfi8xducXTkpttUCYH0ZtZBX+29sF upDorqxPzpTz+pulKVD+g7K3h14pZ/al73VeQKt1+Jr69O+6j6D4XpSt Subject: [FFmpeg-devel] [PATCH 1/4] avcodec/g729postfilter: Optimize out overflowing multiplication from apply_tilt_comp() 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" Fixes: signed integer overflow: -1114392282 * 2 cannot be represented in type 'int' Fixes: 19236/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_G729_fuzzer-5741678938030080 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavcodec/g729postfilter.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/libavcodec/g729postfilter.c b/libavcodec/g729postfilter.c index fc9a8d54cc..ab668594d2 100644 --- a/libavcodec/g729postfilter.c +++ b/libavcodec/g729postfilter.c @@ -486,14 +486,14 @@ static int16_t apply_tilt_comp(int16_t* out, int16_t* res_pst, int refl_coeff, if (refl_coeff > 0) { gt = (refl_coeff * G729_TILT_FACTOR_PLUS + 0x4000) >> 15; - fact = 0x4000; // 0.5 in (0.15) - sh_fact = 15; + fact = 0x2000; // 0.5 in (0.15) + sh_fact = 14; } else { gt = (refl_coeff * G729_TILT_FACTOR_MINUS + 0x4000) >> 15; - fact = 0x800; // 0.5 in (3.12) - sh_fact = 12; + fact = 0x400; // 0.5 in (3.12) + sh_fact = 11; } - ga = (fact << 15) / av_clip_int16(32768 - FFABS(gt)); + ga = (fact << 16) / av_clip_int16(32768 - FFABS(gt)); gt >>= 1; /* Apply tilt compensation filter to signal. */ @@ -503,12 +503,12 @@ static int16_t apply_tilt_comp(int16_t* out, int16_t* res_pst, int refl_coeff, tmp2 = (gt * res_pst[i-1]) * 2 + 0x4000; tmp2 = res_pst[i] + (tmp2 >> 15); - tmp2 = (tmp2 * ga * 2 + fact) >> sh_fact; + tmp2 = (tmp2 * ga + fact) >> sh_fact; out[i] = tmp2; } tmp2 = (gt * ht_prev_data) * 2 + 0x4000; tmp2 = res_pst[0] + (tmp2 >> 15); - tmp2 = (tmp2 * ga * 2 + fact) >> sh_fact; + tmp2 = (tmp2 * ga + fact) >> sh_fact; out[0] = tmp2; return tmp;