{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmem: Fix shift-out-of-bound (UBSAN) with byte size cells\n\nIf a cell has 'nbits' equal to a multiple of BITS_PER_BYTE the logic\n\n *p &= GENMASK((cell->nbits%BITS_PER_BYTE) - 1, 0);\n\nwill become undefined behavior because nbits modulo BITS_PER_BYTE is 0, and we\nsubtract one from that making a large number that is then shifted more than the\nnumber of bits that fit into an unsigned long.\n\nUBSAN reports this problem:\n\n UBSAN: shift-out-of-bounds in drivers/nvmem/core.c:1386:8\n shift exponent 64 is too large for 64-bit type 'unsigned long'\n CPU: 6 PID: 7 Comm: kworker/u16:0 Not tainted 5.15.0-rc3+ #9\n Hardware name: Google Lazor (rev3+) with KB Backlight (DT)\n Workqueue: events_unbound deferred_probe_work_func\n Call trace:\n  dump_backtrace+0x0/0x170\n  show_stack+0x24/0x30\n  dump_stack_lvl+0x64/0x7c\n  dump_stack+0x18/0x38\n  ubsan_epilogue+0x10/0x54\n  __ubsan_handle_shift_out_of_bounds+0x180/0x194\n  __nvmem_cell_read+0x1ec/0x21c\n  nvmem_cell_read+0x58/0x94\n  nvmem_cell_read_variable_common+0x4c/0xb0\n  nvmem_cell_read_variable_le_u32+0x40/0x100\n  a6xx_gpu_init+0x170/0x2f4\n  adreno_bind+0x174/0x284\n  component_bind_all+0xf0/0x264\n  msm_drm_bind+0x1d8/0x7a0\n  try_to_bring_up_master+0x164/0x1ac\n  __component_add+0xbc/0x13c\n  component_add+0x20/0x2c\n  dp_display_probe+0x340/0x384\n  platform_probe+0xc0/0x100\n  really_probe+0x110/0x304\n  __driver_probe_device+0xb8/0x120\n  driver_probe_device+0x4c/0xfc\n  __device_attach_driver+0xb0/0x128\n  bus_for_each_drv+0x90/0xdc\n  __device_attach+0xc8/0x174\n  device_initial_probe+0x20/0x2c\n  bus_probe_device+0x40/0xa4\n  deferred_probe_work_func+0x7c/0xb8\n  process_one_work+0x128/0x21c\n  process_scheduled_works+0x40/0x54\n  worker_thread+0x1ec/0x2a8\n  kthread+0x138/0x158\n  ret_from_fork+0x10/0x20\n\nFix it by making sure there are any bits to mask out."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/nvmem/core.c"
               ],
               "versions": [
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "abcb8d33e4d2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "60df06bbdf49",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "2df6c0230502",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "eb0fc8e7170e",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "0594f1d048d8",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "57e48886401b",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "0e822e5413da",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "69aba7948cbe",
                     "lessThan": "5d388fa01fa6",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/nvmem/core.c"
               ],
               "versions": [
                  {
                     "version": "4.3",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "4.3",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.4.290",
                     "lessThanOrEqual": "4.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.9.288",
                     "lessThanOrEqual": "4.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.252",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.213",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.155",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.75",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.14.14",
                     "lessThanOrEqual": "5.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/abcb8d33e4d2215ccde5ab5ccf9f730a59d79d97"
            },
            {
               "url": "https://git.kernel.org/stable/c/60df06bbdf497e37ed25ad40572c362e5b0998df"
            },
            {
               "url": "https://git.kernel.org/stable/c/2df6c023050205c4d04ffc121bc549f65cb8d1df"
            },
            {
               "url": "https://git.kernel.org/stable/c/eb0fc8e7170e61eaf65d28dee4a8baf4e86b19ca"
            },
            {
               "url": "https://git.kernel.org/stable/c/0594f1d048d8dc338eb9a240021b1d00ae1eb082"
            },
            {
               "url": "https://git.kernel.org/stable/c/57e48886401b14cd351423fabfec2cfd18df4f66"
            },
            {
               "url": "https://git.kernel.org/stable/c/0e822e5413da1af28cca350cb1cb42b6133bdcae"
            },
            {
               "url": "https://git.kernel.org/stable/c/5d388fa01fa6eb310ac023a363a6cb216d9d8fe9"
            }
         ],
         "title": "nvmem: Fix shift-out-of-bound (UBSAN) with byte size cells",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-47497",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}