[linux-next:master 8114/13337] drivers/vfio/pci/nvgrace-gpu/main.c:718 nvgrace_gpu_fetch_memory_property() warn: impossible condition '(*pmemphys > ((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 8 - 1 - (((-1)) < 1)))))) => (0-u64max > u64max)'

[kernel test robot <lkp@intel.com>]

BCC: lkp@intel.com
CC: oe-kbuild-all@lists.linux.dev
CC: Linux Memory Management List <linux-mm@kvack.org>
TO: Ankit Agrawal <ankita@nvidia.com>
CC: Alex Williamson <alex.williamson@redhat.com>
CC: Kevin Tian <kevin.tian@intel.com>
CC: Yishai Hadas <yishaih@nvidia.com>
CC: Zhi Wang <zhi.wang.linux@gmail.com>
CC: Aniket Agashe <aniketa@nvidia.com>

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   a1184cae56bcb96b86df3ee0377cec507a3f56e0
commit: 701ab935859fcfd4a8c8a97f3ee4fb5294a9d481 [8114/13337] vfio/nvgrace-gpu: Add vfio pci variant module for grace hopper
:::::: branch date: 24 hours ago
:::::: commit date: 3 weeks ago
config: loongarch-randconfig-r081-20240312 (https://download.01.org/0day-ci/archive/20240313/202403131244.nouxrenP-lkp@intel.com/config)
compiler: loongarch64-linux-gcc (GCC) 13.2.0

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 <lkp@intel.com>
| Reported-by: Dan Carpenter <error27@gmail.com>
| Closes: https://lore.kernel.org/r/202403131244.nouxrenP-lkp@intel.com/

smatch warnings:
drivers/vfio/pci/nvgrace-gpu/main.c:718 nvgrace_gpu_fetch_memory_property() warn: impossible condition '(*pmemphys > ((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 8 - 1 - (((-1)) < 1)))))) => (0-u64max > u64max)'
drivers/vfio/pci/nvgrace-gpu/main.c:726 nvgrace_gpu_fetch_memory_property() warn: impossible condition '(*pmemlength > ((((1 << (8 * 8 - 1 - (((-1)) < 1))) - 1) + (1 << (8 * 8 - 1 - (((-1)) < 1)))))) => (0-u64max > u64max)'

vim +718 drivers/vfio/pci/nvgrace-gpu/main.c

701ab935859fcf Ankit Agrawal 2024-02-20  702  
701ab935859fcf Ankit Agrawal 2024-02-20  703  static int
701ab935859fcf Ankit Agrawal 2024-02-20  704  nvgrace_gpu_fetch_memory_property(struct pci_dev *pdev,
701ab935859fcf Ankit Agrawal 2024-02-20  705  				  u64 *pmemphys, u64 *pmemlength)
701ab935859fcf Ankit Agrawal 2024-02-20  706  {
701ab935859fcf Ankit Agrawal 2024-02-20  707  	int ret;
701ab935859fcf Ankit Agrawal 2024-02-20  708  
701ab935859fcf Ankit Agrawal 2024-02-20  709  	/*
701ab935859fcf Ankit Agrawal 2024-02-20  710  	 * The memory information is present in the system ACPI tables as DSD
701ab935859fcf Ankit Agrawal 2024-02-20  711  	 * properties nvidia,gpu-mem-base-pa and nvidia,gpu-mem-size.
701ab935859fcf Ankit Agrawal 2024-02-20  712  	 */
701ab935859fcf Ankit Agrawal 2024-02-20  713  	ret = device_property_read_u64(&pdev->dev, "nvidia,gpu-mem-base-pa",
701ab935859fcf Ankit Agrawal 2024-02-20  714  				       pmemphys);
701ab935859fcf Ankit Agrawal 2024-02-20  715  	if (ret)
701ab935859fcf Ankit Agrawal 2024-02-20  716  		return ret;
701ab935859fcf Ankit Agrawal 2024-02-20  717  
701ab935859fcf Ankit Agrawal 2024-02-20 @718  	if (*pmemphys > type_max(phys_addr_t))
701ab935859fcf Ankit Agrawal 2024-02-20  719  		return -EOVERFLOW;
701ab935859fcf Ankit Agrawal 2024-02-20  720  
701ab935859fcf Ankit Agrawal 2024-02-20  721  	ret = device_property_read_u64(&pdev->dev, "nvidia,gpu-mem-size",
701ab935859fcf Ankit Agrawal 2024-02-20  722  				       pmemlength);
701ab935859fcf Ankit Agrawal 2024-02-20  723  	if (ret)
701ab935859fcf Ankit Agrawal 2024-02-20  724  		return ret;
701ab935859fcf Ankit Agrawal 2024-02-20  725  
701ab935859fcf Ankit Agrawal 2024-02-20 @726  	if (*pmemlength > type_max(size_t))
701ab935859fcf Ankit Agrawal 2024-02-20  727  		return -EOVERFLOW;
701ab935859fcf Ankit Agrawal 2024-02-20  728  
701ab935859fcf Ankit Agrawal 2024-02-20  729  	/*
701ab935859fcf Ankit Agrawal 2024-02-20  730  	 * If the C2C link is not up due to an error, the coherent device
701ab935859fcf Ankit Agrawal 2024-02-20  731  	 * memory size is returned as 0. Fail in such case.
701ab935859fcf Ankit Agrawal 2024-02-20  732  	 */
701ab935859fcf Ankit Agrawal 2024-02-20  733  	if (*pmemlength == 0)
701ab935859fcf Ankit Agrawal 2024-02-20  734  		return -ENOMEM;
701ab935859fcf Ankit Agrawal 2024-02-20  735  
701ab935859fcf Ankit Agrawal 2024-02-20  736  	return ret;
701ab935859fcf Ankit Agrawal 2024-02-20  737  }
701ab935859fcf Ankit Agrawal 2024-02-20  738  

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