From nobody Mon Feb 9 12:24:59 2026 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (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 C87362E7167 for ; Thu, 9 Oct 2025 12:30:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760013035; cv=none; b=us6+H50FszUZeCfUPJX6fpSEDVmffQN/+zVV0OFQOwWX6HZPbIF2nDgdJmJMPxwBR53i8/m+SN0AS0Ds9WIDmg+nI1lvAvZ742FbxWNGBvvuMxCqLEVVnoXfidb5ZxA4KldST2ypv8B8/5CLLAydlF86HtTEFPNdBTJ0iwFQ+ek= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760013035; c=relaxed/simple; bh=gUEahKKYOUH2kVxO/lDajkAlCzV30k4qOuQ5Yr4X7sc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=UFtkT15o2gSKhqYZTPNa3rDx2sZgOTNH8V9ESPVlKbQc3v6l2nc48sYgwHaPRrGAe7NHzX5OzUR5QvPKp290mLYk3xhwXhdTrYaWhm6OivOuNdfY0OaoGfCf0btx5C9iukfj++xSBXdUBS1VExzinsHrGPuTThSVntXFNMJ8zlY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=CihcOl6U; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="CihcOl6U" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1760013032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aSDCPJnmMxBRqtQR+6ffqI3zTDae1cNcYyEpjejHE4g=; b=CihcOl6U9BqrMWtl/3AEzvwbB9Ps+uXqgeO4kF3W1zlolAO7NyfhtSbJyKdk83ME+h+5tQ MYeCTVkHO1NoYFYNkmxaCCRb+BFmPH5dDRVfi4jjPJQ12Ro4XuKNoXDNNjo09MsMdoLdEZ YAePKA2ZcXMeHDnZhdwGZZQajBIEj0k= Received: from mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-47-_mRjGOe-N1COQ5vjhdKE7A-1; Thu, 09 Oct 2025 08:30:27 -0400 X-MC-Unique: _mRjGOe-N1COQ5vjhdKE7A-1 X-Mimecast-MFC-AGG-ID: _mRjGOe-N1COQ5vjhdKE7A_1760013026 Received: from mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.111]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 2AF7519560BB; Thu, 9 Oct 2025 12:30:26 +0000 (UTC) Received: from hydra.redhat.com (unknown [10.45.225.212]) by mx-prod-int-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id B92191800982; Thu, 9 Oct 2025 12:30:22 +0000 (UTC) From: Jocelyn Falempe To: Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jocelyn Falempe , Javier Martinez Canillas , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org Subject: [PATCH 3/6] drm/panic: Fix qr_code, ensure vmargin is positive Date: Thu, 9 Oct 2025 14:24:50 +0200 Message-ID: <20251009122955.562888-4-jfalempe@redhat.com> In-Reply-To: <20251009122955.562888-1-jfalempe@redhat.com> References: <20251009122955.562888-1-jfalempe@redhat.com> 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-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 Content-Type: text/plain; charset="utf-8" Depending on qr_code size and screen size, the vertical margin can be negative, that means there is not enough room to draw the qr_code. So abort early, to avoid a segfault by trying to draw at negative coordinates. Fixes: cb5164ac43d0f ("drm/panic: Add a QR code panic screen") Signed-off-by: Jocelyn Falempe Reviewed-by: Javier Martinez Canillas --- drivers/gpu/drm/drm_panic.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_panic.c b/drivers/gpu/drm/drm_panic.c index 179cbf21f22d..281bb2dabf81 100644 --- a/drivers/gpu/drm/drm_panic.c +++ b/drivers/gpu/drm/drm_panic.c @@ -736,7 +736,10 @@ static int _draw_panic_static_qr_code(struct drm_scano= ut_buffer *sb) pr_debug("QR width %d and scale %d\n", qr_width, scale); r_qr_canvas =3D DRM_RECT_INIT(0, 0, qr_canvas_width * scale, qr_canvas_wi= dth * scale); =20 - v_margin =3D (sb->height - drm_rect_height(&r_qr_canvas) - drm_rect_heigh= t(&r_msg)) / 5; + v_margin =3D sb->height - drm_rect_height(&r_qr_canvas) - drm_rect_height= (&r_msg); + if (v_margin < 0) + return -ENOSPC; + v_margin /=3D 5; =20 drm_rect_translate(&r_qr_canvas, (sb->width - r_qr_canvas.x2) / 2, 2 * v_= margin); r_qr =3D DRM_RECT_INIT(r_qr_canvas.x1 + QR_MARGIN * scale, r_qr_canvas.y1= + QR_MARGIN * scale, --=20 2.51.0