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X-CSE-ConnectionGUID: QaqsOsjLRgyGU7BqLwpBOQ== X-CSE-MsgGUID: BOKnDbHqTC6jj9sDCUNEaA== X-IronPort-AV: E=McAfee;i="6800,10657,11723"; a="74080444" X-IronPort-AV: E=Sophos;i="6.23,109,1770624000"; d="scan'208";a="74080444" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa110.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 08 Mar 2026 15:30:05 -0700 X-CSE-ConnectionGUID: itF3tMAeQba3I88Z0IudZg== X-CSE-MsgGUID: Tmq4KOgwTOivgyZ0C/DA2A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,109,1770624000"; d="scan'208";a="218713151" Received: from lkp-server01.sh.intel.com (HELO 058beb05654c) ([10.239.97.150]) by orviesa006.jf.intel.com with ESMTP; 08 Mar 2026 15:30:04 -0700 Received: from kbuild by 058beb05654c with local (Exim 4.98.2) (envelope-from ) id 1vzMdM-000000003Qu-2tFf; Sun, 08 Mar 2026 22:30:00 +0000 Date: Mon, 09 Mar 2026 06:29:11 +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: <202603090633.tFwzlZSd-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: 2 days ago :::::: commit date: 2 days ago config: openrisc-randconfig-r071-20260307 (https://download.01.org/0day-ci/archive/20260309/202603090633.tFwzlZSd-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/202603090633.tFwzlZSd-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 f39db26c54281d Sui Jingfeng 2023-06-15 632 76dedd5c839e0b Jens Axboe 2024-04-09 633 static ssize_t lsdc_crtc_man_op_write(struct kiocb *iocb, struct iov_iter *from) f39db26c54281d Sui Jingfeng 2023-06-15 634 { 76dedd5c839e0b Jens Axboe 2024-04-09 635 struct seq_file *m = iocb->ki_filp->private_data; f39db26c54281d Sui Jingfeng 2023-06-15 636 struct lsdc_crtc *lcrtc = m->private; f39db26c54281d Sui Jingfeng 2023-06-15 637 const struct lsdc_crtc_hw_ops *ops = lcrtc->hw_ops; 76dedd5c839e0b Jens Axboe 2024-04-09 638 size_t len = iov_iter_count(from); f39db26c54281d Sui Jingfeng 2023-06-15 639 char buf[16]; f39db26c54281d Sui Jingfeng 2023-06-15 640 f39db26c54281d Sui Jingfeng 2023-06-15 641 if (len > sizeof(buf) - 1) f39db26c54281d Sui Jingfeng 2023-06-15 642 return -EINVAL; f39db26c54281d Sui Jingfeng 2023-06-15 643 76dedd5c839e0b Jens Axboe 2024-04-09 644 if (!copy_from_iter_full(buf, len, from)) f39db26c54281d Sui Jingfeng 2023-06-15 645 return -EFAULT; f39db26c54281d Sui Jingfeng 2023-06-15 646 f39db26c54281d Sui Jingfeng 2023-06-15 @647 buf[len] = '\0'; f39db26c54281d Sui Jingfeng 2023-06-15 648 f39db26c54281d Sui Jingfeng 2023-06-15 649 if (sysfs_streq(buf, "soft_reset")) f39db26c54281d Sui Jingfeng 2023-06-15 650 ops->soft_reset(lcrtc); f39db26c54281d Sui Jingfeng 2023-06-15 651 else if (sysfs_streq(buf, "enable")) f39db26c54281d Sui Jingfeng 2023-06-15 652 ops->enable(lcrtc); f39db26c54281d Sui Jingfeng 2023-06-15 653 else if (sysfs_streq(buf, "disable")) f39db26c54281d Sui Jingfeng 2023-06-15 654 ops->disable(lcrtc); f39db26c54281d Sui Jingfeng 2023-06-15 655 else if (sysfs_streq(buf, "flip")) f39db26c54281d Sui Jingfeng 2023-06-15 656 ops->flip(lcrtc); f39db26c54281d Sui Jingfeng 2023-06-15 657 else if (sysfs_streq(buf, "clone")) f39db26c54281d Sui Jingfeng 2023-06-15 658 ops->clone(lcrtc); f39db26c54281d Sui Jingfeng 2023-06-15 659 f39db26c54281d Sui Jingfeng 2023-06-15 660 return len; f39db26c54281d Sui Jingfeng 2023-06-15 661 } f39db26c54281d 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