From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.16]) (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 9F0F217BBF; Tue, 24 Sep 2024 12:11:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.16 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727179878; cv=none; b=XaXqhXJtTNV+Mwm7HyZ2XFDAg2mdDES5T8nwPWTFF6TcgVtsBnAUbCG1SOKNopBJHP+oo1jYczxeyOqfkQb/2zm2lv/9WguStXPFSsAXP0ahWqPcPQi/Ud+pf3Bo6oshjDYvJ0+5ifJVaN3wHeenT6k6x4iHdfgsdpnbV0jTymw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1727179878; c=relaxed/simple; bh=dTad2rqpcko2TGpyvtRSd9oTstyIASGq7zS6vS0Dg9U=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=cWt5m06AOeLWvG6CykbNLvjoPtQk6qrhJol4IHVvdQRSmE5F5VRnQQb4hJMGrSFPUtdvffLBSMJnjtve9rOLczh7IwNRYyRQ/s+r3EIMX6h71SRjMtTcmAvvoAFIIQfBNZN9WY6C9B69dZLXyx5HL/bM9WozujXjO63/mHFWR7U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=aGbd0FLy; arc=none smtp.client-ip=198.175.65.16 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="aGbd0FLy" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1727179877; x=1758715877; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version:content-transfer-encoding; bh=dTad2rqpcko2TGpyvtRSd9oTstyIASGq7zS6vS0Dg9U=; b=aGbd0FLytC5WcM9SqO3ccj7M+6q1um/CHrhIMG0YlLXyjgFPMhW6AkIQ wGmt6aD1j2WtrsezoMuedBHAmT/2CWB48mUaWG8ckNc2vt4vdA87jPVqR fkTdAZariqXuty9xQPhg5D4oE9m6/3jqshqm6XgoFHj4Mn1TqYXfctrdY CFKa5bcNSl61GyVuJj7sIhvVQrICVWn0uSbLJh8bH6V5NPqd6qL6Dyt71 yguKarOfuP3dtnU/Yze+tmhUk+6VCPQlJuO2lKE+dXElTw3IV9iXyqOkj EcCT5a2Icp9N9rW22FlQURIlbL8tSjqVdvR7SF0tCpIpn1LmkoETtRS5R w==; X-CSE-ConnectionGUID: On+UWo6eQUWK98NnpvYrtQ== X-CSE-MsgGUID: kvCGu/vaTnaQvnVwaW1GJw== X-IronPort-AV: E=McAfee;i="6700,10204,11204"; a="26265035" X-IronPort-AV: E=Sophos;i="6.10,254,1719903600"; d="scan'208";a="26265035" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2024 05:11:17 -0700 X-CSE-ConnectionGUID: H3KdpKbwRua8SWIdpicqLQ== X-CSE-MsgGUID: M3YEhQRFSpKiwBoJ2gYEMg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,254,1719903600"; d="scan'208";a="75790881" Received: from sschumil-mobl2.ger.corp.intel.com (HELO localhost) ([10.245.246.183]) by fmviesa005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Sep 2024 05:11:12 -0700 From: Jani Nikula To: George Rurikov Cc: George Rurikov , Rodrigo Vivi , Joonas Lahtinen , Tvrtko Ursulin , David Airlie , Simona Vetter , intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: Re: [PATCH] drm: Add check for encoder in intel_get_crtc_new_encoder() In-Reply-To: <87tte545pc.fsf@intel.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20240924114004.1084283-1-g.ryurikov@securitycode.ru> <87tte545pc.fsf@intel.com> Date: Tue, 24 Sep 2024 15:11:08 +0300 Message-ID: <87o74d45gj.fsf@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On Tue, 24 Sep 2024, Jani Nikula wrote: > On Tue, 24 Sep 2024, George Rurikov wrote: >> If the video card driver could not find the connector assigned to the >> current video controller, or if the hardware status has changed so that >> a pre-existing connector is no longer active, none of the state >> connectors will meet the assignment criteria for the current crtc video >> controller. >> >> In the drm_WARN function, encoder->base.dev is called, so >> '&encoder->base.dev' will be dereferenced since encoder will still be >> initialized NULL. > > encoder is not dereferenced there. Looks like the issue was there ages ago, and was fixed in v6.5 by commit 3b6692357f70 ("drm/i915: Make intel_get_crtc_new_encoder() less oopsy"). Please run your analysis on recent kernels. BR, Jani. > >> Found by Linux Verification Center (linuxtesting.org) with SVACE. >> >> Fixes: e12d6218fda2 ("drm/i915: Reduce bigjoiner special casing") >> Cc: stable@vger.kernel.org >> Signed-off-by: George Rurikov >> --- >> drivers/gpu/drm/i915/display/intel_display.c | 4 +++- >> 1 file changed, 3 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/= drm/i915/display/intel_display.c >> index b4ef4d59da1a..1f25b12e5f67 100644 >> --- a/drivers/gpu/drm/i915/display/intel_display.c >> +++ b/drivers/gpu/drm/i915/display/intel_display.c >> @@ -819,9 +819,11 @@ intel_get_crtc_new_encoder(const struct intel_atomi= c_state *state, >> num_encoders++; >> } >> >> - drm_WARN(state->base.dev, num_encoders !=3D 1, >> + if (encoder) { >> + drm_WARN(state->base.dev, num_encoders !=3D 1, >> "%d encoders for pipe %c\n", >> num_encoders, pipe_name(primary_crtc->pipe)); >> + } >> >> return encoder; >> } >> -- >> 2.34.1 >> >> =D0=97=D0=B0=D1=8F=D0=B2=D0=BB=D0=B5=D0=BD=D0=B8=D0=B5 =D0=BE =D0=BA=D0= =BE=D0=BD=D1=84=D0=B8=D0=B4=D0=B5=D0=BD=D1=86=D0=B8=D0=B0=D0=BB=D1=8C=D0=BD= =D0=BE=D1=81=D1=82=D0=B8 >> >> =D0=94=D0=B0=D0=BD=D0=BD=D0=BE=D0=B5 =D1=8D=D0=BB=D0=B5=D0=BA=D1=82=D1= =80=D0=BE=D0=BD=D0=BD=D0=BE=D0=B5 =D0=BF=D0=B8=D1=81=D1=8C=D0=BC=D0=BE =D0= =B8 =D0=BB=D1=8E=D0=B1=D1=8B=D0=B5 =D0=BF=D1=80=D0=B8=D0=BB=D0=BE=D0=B6=D0= =B5=D0=BD=D0=B8=D1=8F =D0=BA =D0=BD=D0=B5=D0=BC=D1=83 =D1=8F=D0=B2=D0=BB=D1= =8F=D1=8E=D1=82=D1=81=D1=8F =D0=BA=D0=BE=D0=BD=D1=84=D0=B8=D0=B4=D0=B5=D0= =BD=D1=86=D0=B8=D0=B0=D0=BB=D1=8C=D0=BD=D1=8B=D0=BC=D0=B8 =D0=B8 =D0=BF=D1= =80=D0=B5=D0=B4=D0=BD=D0=B0=D0=B7=D0=BD=D0=B0=D1=87=D0=B5=D0=BD=D1=8B =D0= =B8=D1=81=D0=BA=D0=BB=D1=8E=D1=87=D0=B8=D1=82=D0=B5=D0=BB=D1=8C=D0=BD=D0=BE= =D0=B4=D0=BB=D1=8F =D0=B0=D0=B4=D1=80=D0=B5=D1=81=D0=B0=D1=82=D0=B0. =D0= =95=D1=81=D0=BB=D0=B8 =D0=92=D1=8B =D0=BD=D0=B5 =D1=8F=D0=B2=D0=BB=D1=8F=D0= =B5=D1=82=D0=B5=D1=81=D1=8C =D0=B0=D0=B4=D1=80=D0=B5=D1=81=D0=B0=D1=82=D0= =BE=D0=BC =D0=B4=D0=B0=D0=BD=D0=BD=D0=BE=D0=B3=D0=BE =D0=BF=D0=B8=D1=81=D1= =8C=D0=BC=D0=B0, =D0=BF=D0=BE=D0=B6=D0=B0=D0=BB=D1=83=D0=B9=D1=81=D1=82=D0= =B0, =D1=83=D0=B2=D0=B5=D0=B4=D0=BE=D0=BC=D0=B8=D1=82=D0=B5 =D0=BD=D0=B5=D0= =BC=D0=B5=D0=B4=D0=BB=D0=B5=D0=BD=D0=BD=D0=BE =D0=BE=D1=82=D0=BF=D1=80=D0= =B0=D0=B2=D0=B8=D1=82=D0=B5=D0=BB=D1=8F, =D0=BD=D0=B5 =D1=80=D0=B0=D1=81=D0= =BA=D1=80=D1=8B=D0=B2=D0=B0=D0=B9=D1=82=D0=B5 =D1=81=D0=BE=D0=B4=D0=B5=D1= =80=D0=B6=D0=B0=D0=BD=D0=B8=D0=B5 =D0=B4=D1=80=D1=83=D0=B3=D0=B8=D0=BC =D0= =BB=D0=B8=D1=86=D0=B0=D0=BC, =D0=BD=D0=B5 =D0=B8=D1=81=D0=BF=D0=BE=D0=BB=D1= =8C=D0=B7=D1=83=D0=B9=D1=82=D0=B5 =D0=B5=D0=B3=D0=BE =D0=B2 =D0=BA=D0=B0=D0= =BA=D0=B8=D1=85-=D0=BB=D0=B8=D0=B1=D0=BE =D1=86=D0=B5=D0=BB=D1=8F=D1=85, = =D0=BD=D0=B5 =D1=85=D1=80=D0=B0=D0=BD=D0=B8=D1=82=D0=B5 =D0=B8 =D0=BD=D0=B5= =D0=BA=D0=BE=D0=BF=D0=B8=D1=80=D1=83=D0=B9=D1=82=D0=B5 =D0=B8=D0=BD=D1=84= =D0=BE=D1=80=D0=BC=D0=B0=D1=86=D0=B8=D1=8E =D0=BB=D1=8E=D0=B1=D1=8B=D0=BC = =D1=81=D0=BF=D0=BE=D1=81=D0=BE=D0=B1=D0=BE=D0=BC. > > Sorry, we can't accept patches with that boilerplate anyway. > > BR, > Jani. --=20 Jani Nikula, Intel