From nobody Sat Feb 7 05:48:54 2026 Received: from mx1.t-argos.ru (mx1.t-argos.ru [109.73.34.58]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D60FC481A6 for ; Mon, 8 Apr 2024 13:02:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=109.73.34.58 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712581371; cv=none; b=W7CajIol7MajOgg7d6T/0bxQgWMR+Wpf0uSY8M0hmUkaUY3VxSKs+n9agrEXZHKwtUZFMUENSkDiFRak0gPUTNkn+mDwqyA/53dV2wLst8nabd2sj1I/z4Liqb/MG98+G3pTtJP2/132TmE+H9nVA2YSnbts0tgSpRG/xuva6wA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1712581371; c=relaxed/simple; bh=ZXfvgeDROZep0slQBXDkO+E1iJzwIlpz6tUv4s83HYk=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=RC0LehfKpovThoTw1m6dI0KR0RWdz4uGIclRia11LF/a9Ld08Kbv4UCaphbcdYys4TGzt5Fzl+9BiSCXzVBWin8ZR4oMwjxx+QGWcTx3knyyHRHXhoNBa09QoAZ2lmsl9Hdhy0q8K2w1HPyXjIp3epOuXPRmNJO+5fADmcVbeqg= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=t-argos.ru; spf=pass smtp.mailfrom=t-argos.ru; dkim=pass (2048-bit key) header.d=t-argos.ru header.i=@t-argos.ru header.b=APVDouur; arc=none smtp.client-ip=109.73.34.58 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=t-argos.ru Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=t-argos.ru Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=t-argos.ru header.i=@t-argos.ru header.b="APVDouur" Received: from mx1.t-argos.ru (localhost [127.0.0.1]) by mx1.t-argos.ru (Postfix) with ESMTP id 4DF53100002; Mon, 8 Apr 2024 16:02:28 +0300 (MSK) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=t-argos.ru; s=mail; t=1712581348; bh=1T7AEdzVVI+WLTfJLcfbhpzyh/ZfKNV6VSBHpjNe3VM=; h=From:To:Subject:Date:Message-ID:MIME-Version:Content-Type; b=APVDouurCYo7J2EyewYYJhe5R+ziwrvmZMsGCPS/HBPIMvflG4KEwdTbJuleyECay dQMvgoig7sWdpQ7xGxhpABVqQqZ8dgkkJEc4EiWQHAgJHxClTIU5bDpM3EkrsQMbZC XRt23IhrH8mc8Ta+yRT1nsCszLJzlG+3FY+k6vFX0YLzdcBdfA9bOJdlmNnIcya8er PtRu3UyyxXRe0cQ2mPRMhlDMSiRklRId/02MjPeyX6lkrpzjPENF/i8kdoyjSgIf4V krFOkOY9eSakkxfeVxYt9RsYXyyEc/Hk5+pWD3qm6TtAuY41f3GmH8cFd42OZIgWPp NlPAlQ05jYYzg== Received: from mx1.t-argos.ru.ru (ta-mail-02.ta.t-argos.ru [172.17.13.212]) by mx1.t-argos.ru (Postfix) with ESMTP; Mon, 8 Apr 2024 15:58:39 +0300 (MSK) Received: from localhost.localdomain (172.17.215.6) by ta-mail-02 (172.17.13.212) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Mon, 8 Apr 2024 15:58:18 +0300 From: Aleksandr Mishin To: Swapnil Jakhade CC: Aleksandr Mishin , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Tomi Valkeinen , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= , Nikhil Devshatwar , Aradhya Bhatia , Jani Nikula , Rob Herring , Zhu Wang , Yuti Amonkar , Jyri Sarha , Quentin Schulz , , , Subject: [PATCH] drm: bridge: cdns-mhdp8546: Fix possible null pointer dereference Date: Mon, 8 Apr 2024 15:58:10 +0300 Message-ID: <20240408125810.21899-1-amishin@t-argos.ru> X-Mailer: git-send-email 2.30.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: ta-mail-02.ta.t-argos.ru (172.17.13.212) To ta-mail-02 (172.17.13.212) X-KSMG-Rule-ID: 1 X-KSMG-Message-Action: clean X-KSMG-AntiSpam-Lua-Profiles: 184622 [Apr 08 2024] X-KSMG-AntiSpam-Version: 6.1.0.4 X-KSMG-AntiSpam-Envelope-From: amishin@t-argos.ru X-KSMG-AntiSpam-Rate: 0 X-KSMG-AntiSpam-Status: not_detected X-KSMG-AntiSpam-Method: none X-KSMG-AntiSpam-Auth: dkim=none X-KSMG-AntiSpam-Info: LuaCore: 15 0.3.15 adb41f89e2951eb37b279104a7abb8e79494a5e7, {Tracking_from_domain_doesnt_match_to}, mx1.t-argos.ru.ru:7.1.1;127.0.0.199:7.1.2;t-argos.ru:7.1.1;d41d8cd98f00b204e9800998ecf8427e.com:7.1.1, FromAlignment: s X-MS-Exchange-Organization-SCL: -1 X-KSMG-AntiSpam-Interceptor-Info: scan successful X-KSMG-AntiPhishing: Clean, bases: 2024/04/08 07:15:00 X-KSMG-AntiVirus: Kaspersky Secure Mail Gateway, version 1.1.2.30, bases: 2024/04/08 06:53:00 #24704467 X-KSMG-AntiVirus-Status: Clean, skipped Content-Type: text/plain; charset="utf-8" In cdns_mhdp_atomic_enable(), the return value of drm_mode_duplicate() is assigned to mhdp_state->current_mode, and there is a dereference of it in drm_mode_set_name(), which will lead to a NULL pointer dereference on failure of drm_mode_duplicate(). Fix this bug add a check of mhdp_state->current_mode. Fixes: fb43aa0acdfd ("drm: bridge: Add support for Cadence MHDP8546 DPI/DP = bridge") Signed-off-by: Aleksandr Mishin --- drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c b/drivers/= gpu/drm/bridge/cadence/cdns-mhdp8546-core.c index e226acc5c15e..8a91ef0ae065 100644 --- a/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c +++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp8546-core.c @@ -2059,6 +2059,9 @@ static void cdns_mhdp_atomic_enable(struct drm_bridge= *bridge, mhdp_state =3D to_cdns_mhdp_bridge_state(new_state); =20 mhdp_state->current_mode =3D drm_mode_duplicate(bridge->dev, mode); + if (!mhdp_state->current_mode) + return; + drm_mode_set_name(mhdp_state->current_mode); =20 dev_dbg(mhdp->dev, "%s: Enabling mode %s\n", __func__, mode->name); --=20 2.30.2