From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.14]) (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 249A0258EC2 for ; Thu, 12 Mar 2026 04:49:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.14 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773290979; cv=none; b=sXruZp+mc2yCSG72fejZZt8nVabldzFZs5+vHGJ8I4sHwhhH7duRwlD00vyuHgxQlWc2XjiSOmBIC25SykVOKbWRGoisbutAWddjtsgda557DyN9f4L/HSCqN0eW6HzwfVITd8amYABeqRtGl1d8CwaGbFRR0dC1Ox3c0oVY0U8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773290979; c=relaxed/simple; bh=XmUD97KB8rvTdfawiSUl76EUd84ZJacIwxiqamdGM30=; h=Date:From:To:Cc:Subject:Message-ID; b=E3XEjDa9o0xsB+zHXwutzOXCM1qXBj6rAizuFUF8riknqczkNadWyKTsAotj/8m5gDV0XG9IaB9QXuerM94i580AodpPhej54gH4hRk/l0VKAT5wekA2sl5psIXeS4OZUaeJGS4QGAhZthxrskfTb8atCFm54B2HUKJT39Fm2fQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=Hb74g301; arc=none smtp.client-ip=198.175.65.14 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=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="Hb74g301" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1773290977; x=1804826977; h=date:from:to:cc:subject:message-id; bh=XmUD97KB8rvTdfawiSUl76EUd84ZJacIwxiqamdGM30=; b=Hb74g301DQzVZJhAGg5pJx9MRrcIjqhBJC/GC1bP7EDUUxeRRgvNcs6M t3DaRvx3NubUgfUVwO7ba0pOAhdNvRjuseX3urwXrShVb2o6ev0kK4fTA hIaUO26NTeuPJVSJQNW/oXico47RL/fS6EcvApPwxcL7WWETzbX+gutYy Fx/nZ1jwHKhypBID02IAhvWK/uDzkyy2sBjUC9GPjKkK58f4D7NYg/sC3 oPJ4Axno7xFuVRTbHd3dh0OO5xtB+2S5NsNwWadsV0VvyjCV+5u39SasL 4O5G+hlGLjeD3rfh1ogDVk67l8smjgzqMKm2unGbD+4XunbfdTq8FVTeG A==; X-CSE-ConnectionGUID: IpVijNVvQaSaSNOq5y5J7w== X-CSE-MsgGUID: rkH+Xyz7S8yWAshpOqjvuQ== X-IronPort-AV: E=McAfee;i="6800,10657,11726"; a="78225347" X-IronPort-AV: E=Sophos;i="6.23,115,1770624000"; d="scan'208";a="78225347" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Mar 2026 21:49:37 -0700 X-CSE-ConnectionGUID: Ijht3+v0TNiLrzvZHxbs+A== X-CSE-MsgGUID: KXbS5mj4SA62nqV+98v76A== X-ExtLoop1: 1 Received: from lkp-server01.sh.intel.com (HELO 418530b1a366) ([10.239.97.150]) by fmviesa003.fm.intel.com with ESMTP; 11 Mar 2026 21:49:35 -0700 Received: from kbuild by 418530b1a366 with local (Exim 4.98.2) (envelope-from ) id 1w0XzJ-0000000025T-0NJP; Thu, 12 Mar 2026 04:49:33 +0000 Date: Thu, 12 Mar 2026 12:48:37 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: [axboe:rw_iter 143/471] drivers/gpu/drm/loongson/lsdc_crtc.c:647 lsdc_crtc_man_op_write() warn: potential spectre issue 'buf' [w] Message-ID: <202603121202.TPjZgGgX-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: Jens Axboe tree: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git rw_iter head: 0a49759be1c3b29207758e467fdc1a90d0716d06 commit: 76dedd5c839e0bd2c29550f6a8491a5676f9b0f3 [143/471] drm/loongson: convert to read/write iterators :::::: branch date: 6 days ago :::::: commit date: 6 days ago config: openrisc-randconfig-r071-20260307 (https://download.01.org/0day-ci/archive/20260312/202603121202.TPjZgGgX-lkp@intel.com/config) compiler: or1k-linux-gcc (GCC) 15.2.0 smatch: v0.5.0-9004-gb810ac53 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202603121202.TPjZgGgX-lkp@intel.com/ smatch warnings: drivers/gpu/drm/loongson/lsdc_crtc.c:647 lsdc_crtc_man_op_write() warn: potential spectre issue 'buf' [w] vim +/buf +647 drivers/gpu/drm/loongson/lsdc_crtc.c f39db26c54281da Sui Jingfeng 2023-06-15 632 76dedd5c839e0bd Jens Axboe 2024-04-09 633 static ssize_t lsdc_crtc_man_op_write(struct kiocb *iocb, struct iov_iter *from) f39db26c54281da Sui Jingfeng 2023-06-15 634 { 76dedd5c839e0bd Jens Axboe 2024-04-09 635 struct seq_file *m = iocb->ki_filp->private_data; f39db26c54281da Sui Jingfeng 2023-06-15 636 struct lsdc_crtc *lcrtc = m->private; f39db26c54281da Sui Jingfeng 2023-06-15 637 const struct lsdc_crtc_hw_ops *ops = lcrtc->hw_ops; 76dedd5c839e0bd Jens Axboe 2024-04-09 638 size_t len = iov_iter_count(from); f39db26c54281da Sui Jingfeng 2023-06-15 639 char buf[16]; f39db26c54281da Sui Jingfeng 2023-06-15 640 f39db26c54281da Sui Jingfeng 2023-06-15 641 if (len > sizeof(buf) - 1) f39db26c54281da Sui Jingfeng 2023-06-15 642 return -EINVAL; f39db26c54281da Sui Jingfeng 2023-06-15 643 76dedd5c839e0bd Jens Axboe 2024-04-09 644 if (!copy_from_iter_full(buf, len, from)) f39db26c54281da Sui Jingfeng 2023-06-15 645 return -EFAULT; f39db26c54281da Sui Jingfeng 2023-06-15 646 f39db26c54281da Sui Jingfeng 2023-06-15 @647 buf[len] = '\0'; f39db26c54281da Sui Jingfeng 2023-06-15 648 f39db26c54281da Sui Jingfeng 2023-06-15 649 if (sysfs_streq(buf, "soft_reset")) f39db26c54281da Sui Jingfeng 2023-06-15 650 ops->soft_reset(lcrtc); f39db26c54281da Sui Jingfeng 2023-06-15 651 else if (sysfs_streq(buf, "enable")) f39db26c54281da Sui Jingfeng 2023-06-15 652 ops->enable(lcrtc); f39db26c54281da Sui Jingfeng 2023-06-15 653 else if (sysfs_streq(buf, "disable")) f39db26c54281da Sui Jingfeng 2023-06-15 654 ops->disable(lcrtc); f39db26c54281da Sui Jingfeng 2023-06-15 655 else if (sysfs_streq(buf, "flip")) f39db26c54281da Sui Jingfeng 2023-06-15 656 ops->flip(lcrtc); f39db26c54281da Sui Jingfeng 2023-06-15 657 else if (sysfs_streq(buf, "clone")) f39db26c54281da Sui Jingfeng 2023-06-15 658 ops->clone(lcrtc); f39db26c54281da Sui Jingfeng 2023-06-15 659 f39db26c54281da Sui Jingfeng 2023-06-15 660 return len; f39db26c54281da Sui Jingfeng 2023-06-15 661 } f39db26c54281da Sui Jingfeng 2023-06-15 662 :::::: The code at line 647 was first introduced by commit :::::: f39db26c54281da6a785259498ca74b5e470476f drm: Add kms driver for loongson display controller :::::: TO: Sui Jingfeng :::::: CC: Sui Jingfeng -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki