Re: [PATCH v2] drm/amdgpu/discovery: validate table offset before IP discovery header cast

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

Hi Pavitra,

kernel test robot noticed the following build errors:

[auto build test ERROR on drm-misc/drm-misc-next]
[also build test ERROR on linus/master v7.2-rc7 next-20260811]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Pavitra-Jha/drm-amdgpu-discovery-validate-table-offset-before-IP-discovery-header-cast/20260812-100224
base:   https://gitlab.freedesktop.org/drm/misc/kernel.git drm-misc-next
patch link:    https://lore.kernel.org/r/20260708061835.111986-1-jhapavitra98%40gmail.com
patch subject: [PATCH v2] drm/amdgpu/discovery: validate table offset before IP discovery header cast
config: loongarch-defconfig (https://download.01.org/0day-ci/archive/20260813/202608130435.5Msck82Q-lkp@intel.com/config)
compiler: clang version 24.0.0git (https://github.com/llvm/llvm-project 12df34b8469b8095359de8c249cb1b2753fadeea)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260813/202608130435.5Msck82Q-lkp@intel.com/reproduce)

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>
| Closes: https://lore.kernel.org/oe-kbuild-all/202608130435.5Msck82Q-lkp@intel.com/

All errors (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:534:25: error: member reference type 'struct table_info' is not a pointer; did you mean to use '.'?
     534 |         if (le16_to_cpu((*info)->offset) >= adev->discovery.size) {
         |                         ~~~~~~~^~
         |                                .
   include/linux/byteorder/generic.h:91:21: note: expanded from macro 'le16_to_cpu'
      91 | #define le16_to_cpu __le16_to_cpu
         |                     ^
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
   drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:536:23: error: member reference type 'struct table_info' is not a pointer; did you mean to use '.'?
     536 |                         le16_to_cpu((*info)->offset), table_id);
         |                                     ~~~~~~~^~
         |                                            .
   include/linux/dev_printk.h:154:65: note: expanded from macro 'dev_err'
     154 |         dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
         |                                                                        ^~~~~~~~~~~
   include/linux/dev_printk.h:110:23: note: expanded from macro 'dev_printk_index_wrap'
     110 |                 _p_func(dev, fmt, ##__VA_ARGS__);                       \
         |                                     ^~~~~~~~~~~
   include/uapi/linux/byteorder/little_endian.h:37:51: note: expanded from macro '__le16_to_cpu'
      37 | #define __le16_to_cpu(x) ((__force __u16)(__le16)(x))
         |                                                   ^
>> drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c:536:34: error: use of undeclared identifier 'table_id'
     536 |                         le16_to_cpu((*info)->offset), table_id);
         |                                                       ^~~~~~~~
   3 errors generated.


vim +534 drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c

   508	
   509	static int amdgpu_discovery_verify_npsinfo(struct amdgpu_device *adev,
   510						   struct table_info *info)
   511	{
   512		uint8_t *discovery_bin = adev->discovery.bin;
   513		uint16_t checksum;
   514		uint16_t offset;
   515	
   516		offset = le16_to_cpu(info->offset);
   517		checksum = le16_to_cpu(info->checksum);
   518	
   519		struct nps_info_header *nhdr =
   520			(struct nps_info_header *)(discovery_bin + offset);
   521	
   522		if (le32_to_cpu(nhdr->table_id) != NPS_INFO_TABLE_ID) {
   523			dev_dbg(adev->dev, "invalid ip discovery nps info table id\n");
   524			return -EINVAL;
   525		}
   526	
   527		if (!amdgpu_discovery_verify_checksum(adev, discovery_bin + offset,
   528						      le32_to_cpu(nhdr->size_bytes),
   529						      checksum)) {
   530			dev_dbg(adev->dev, "invalid nps info data table checksum\n");
   531			return -EINVAL;
   532		}
   533	
 > 534		if (le16_to_cpu((*info)->offset) >= adev->discovery.size) {
   535			dev_err(adev->dev, "invalid table offset %u for table_id %u\n",
 > 536				le16_to_cpu((*info)->offset), table_id);
   537			return -EINVAL;
   538		}
   539	
   540		return 0;
   541	}
   542	

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