From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) (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 8BEE61B4F1F for ; Mon, 20 Jan 2025 10:39:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.7 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737369557; cv=none; b=u6n2MyFYvGBzMk6VhrBxOZ4ln/oziiQJF4bT0GKWRa4wNtuMibw6eLbpHxHL+uG92GXLePvZV2Ex4Lqv7M0J74zrbBPA4EiTjg/r2lX1gtRSQjQmu0WDwsz5vhrFWJhSS7ivqb+FsVhuVZcVkjqFvmBPMmAwpmffFg+SvMhtqXg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737369557; c=relaxed/simple; bh=Cqe4/QTRTJHwKoNcIYNwAIjWzlkT+v0Bi6Kd7JuMZY4=; h=From:To:Cc:Subject:In-Reply-To:References:Date:Message-ID: MIME-Version:Content-Type; b=BPcGNOZHHQZKovu24L9GUMBnjxPFNamSX9fMp45DJ86oArlMtlINWAhDOHeQQ6GhjibeSdedq7ayQQwuhxxVkx4RXsPJlkUIS2yZJEi+WRs7sg3Dn/YIh4XsVkYQHR29govu3P+ex3tCIkOo2klIXkpHqv91zFSev2XBRSS/oTo= 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=M7i3XDt7; arc=none smtp.client-ip=192.198.163.7 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="M7i3XDt7" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1737369554; x=1768905554; h=from:to:cc:subject:in-reply-to:references:date: message-id:mime-version; bh=Cqe4/QTRTJHwKoNcIYNwAIjWzlkT+v0Bi6Kd7JuMZY4=; b=M7i3XDt7uLidRZLlkLFmLCLu1dQ3/4l/c2DqbXiFciU3D6pXGesVnNlG geG/VBrvidUvL5x9iKuhkGjhR+tW+BnqnS9ueysf65P4so8v4N2jlLuSw IrsZ4/wIZVbW3DFnf9u8C3r4HM9DFB82fwJr55LAv7chyMKqxd8lA6N7g RmYDdbevFwUJc0oh0kh0d3K0yVnrW+9+1ZhrP6FaiWbhyOvhJu3JEmQj1 nYwMPwHkWVyJ5CfTB/zsoyNl6Q259N+rX8KpE1JT8XyD2aCJMdADmQAc8 u7jsOYwi+143FHgxeU3XJ3j0TJWuvpQ6pDsB2IcoSJlbWnj3lDJZGjQDm A==; X-CSE-ConnectionGUID: OJOdGAO/R5CWYmlULLRAfA== X-CSE-MsgGUID: ecv7XvG4TvafZitku04ODw== X-IronPort-AV: E=McAfee;i="6700,10204,11320"; a="63117971" X-IronPort-AV: E=Sophos;i="6.13,218,1732608000"; d="scan'208";a="63117971" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2025 02:39:06 -0800 X-CSE-ConnectionGUID: ssWcj3P9TiaoMGmekuLiOw== X-CSE-MsgGUID: f2TgGdh3TNSI9JFwyqInQw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.12,224,1728975600"; d="scan'208";a="110520303" Received: from mjarzebo-mobl1.ger.corp.intel.com (HELO localhost) ([10.245.246.106]) by fmviesa003-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jan 2025 02:39:03 -0800 From: Jani Nikula To: Lu Yao , rodrigo.vivi@intel.com, joonas.lahtinen@linux.intel.com, tursulin@ursulin.net Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Lu Yao Subject: Re: [PATCH] drm/i915: Handle null 'fb' in 'intel_plane_atomic_check_with_state' In-Reply-To: <20250120053908.94339-1-yaolu@kylinos.cn> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo References: <20250120053908.94339-1-yaolu@kylinos.cn> Date: Mon, 20 Jan 2025 12:39:00 +0200 Message-ID: <87h65trcqj.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 On Mon, 20 Jan 2025, Lu Yao wrote: > Add null pointer check before use fb. > Reported by smatch. If new_plane_state->uapi.visible is true, fb will be non-NULL too, but smatch is unable to see that. Adding these checks makes one believe that this is not something you can rely on. BR, Jani. > > Signed-off-by: Lu Yao > --- > drivers/gpu/drm/i915/display/intel_atomic_plane.c | 6 +++--- > 1 file changed, 3 insertions(+), 3 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c > index d89630b2d5c1..20bfa9589ee7 100644 > --- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c > +++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c > @@ -640,18 +640,18 @@ int intel_plane_atomic_check_with_state(const struct intel_crtc_state *old_crtc_ > intel_plane_is_scaled(new_plane_state)) > new_crtc_state->scaled_planes |= BIT(plane->id); > > - if (new_plane_state->uapi.visible && > + if (fb && new_plane_state->uapi.visible && > intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) > new_crtc_state->nv12_planes |= BIT(plane->id); > > - if (new_plane_state->uapi.visible && > + if (fb && new_plane_state->uapi.visible && > fb->format->format == DRM_FORMAT_C8) > new_crtc_state->c8_planes |= BIT(plane->id); > > if (new_plane_state->uapi.visible || old_plane_state->uapi.visible) > new_crtc_state->update_planes |= BIT(plane->id); > > - if (new_plane_state->uapi.visible && > + if (fb && new_plane_state->uapi.visible && > intel_format_info_is_yuv_semiplanar(fb->format, fb->modifier)) { > new_crtc_state->data_rate_y[plane->id] = > intel_plane_data_rate(new_crtc_state, new_plane_state, 0); -- Jani Nikula, Intel