{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nregmap: Fix possible double-free in regcache_rbtree_exit()\n\nIn regcache_rbtree_insert_to_block(), when 'present' realloc failed,\nthe 'blk' which is supposed to assign to 'rbnode->block' will be freed,\nso 'rbnode->block' points a freed memory, in the error handling path of\nregcache_rbtree_init(), 'rbnode->block' will be freed again in\nregcache_rbtree_exit(), KASAN will report double-free as follows:\n\nBUG: KASAN: double-free or invalid-free in kfree+0xce/0x390\nCall Trace:\n slab_free_freelist_hook+0x10d/0x240\n kfree+0xce/0x390\n regcache_rbtree_exit+0x15d/0x1a0\n regcache_rbtree_init+0x224/0x2c0\n regcache_init+0x88d/0x1310\n __regmap_init+0x3151/0x4a80\n __devm_regmap_init+0x7d/0x100\n madera_spi_probe+0x10f/0x333 [madera_spi]\n spi_probe+0x183/0x210\n really_probe+0x285/0xc30\n\nTo fix this, moving up the assignment of rbnode->block to immediately after\nthe reallocation has succeeded so that the data structure stays valid even\nif the second reallocation fails."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "drivers/base/regmap/regcache-rbtree.c"
               ],
               "versions": [
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "e72dce9afbdb",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "fc081477b47d",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "758ced2c3878",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "3dae1a4eced3",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "1cead23c1c0b",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "36e911a16b37",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "50cc1462a668",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "3f4ff561bc88",
                     "lessThan": "55e6d8037805",
                     "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/base/regmap/regcache-rbtree.c"
               ],
               "versions": [
                  {
                     "version": "3.12",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "3.12",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.4.291",
                     "lessThanOrEqual": "4.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.9.289",
                     "lessThanOrEqual": "4.9.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.14.254",
                     "lessThanOrEqual": "4.14.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "4.19.215",
                     "lessThanOrEqual": "4.19.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.4.157",
                     "lessThanOrEqual": "5.4.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.77",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.14.16",
                     "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/e72dce9afbdbfa70d9b44f5908a50ff6c4858999"
            },
            {
               "url": "https://git.kernel.org/stable/c/fc081477b47dfc3a6cb50a96087fc29674013fc2"
            },
            {
               "url": "https://git.kernel.org/stable/c/758ced2c3878ff789801e6fee808e185c5cf08d6"
            },
            {
               "url": "https://git.kernel.org/stable/c/3dae1a4eced3ee733d7222e69b8a55caf2d61091"
            },
            {
               "url": "https://git.kernel.org/stable/c/1cead23c1c0bc766dacb900a3b0269f651ad596f"
            },
            {
               "url": "https://git.kernel.org/stable/c/36e911a16b377bde0ad91a8c679069d0d310b1a6"
            },
            {
               "url": "https://git.kernel.org/stable/c/50cc1462a668dc62949a1127388bc3af785ce047"
            },
            {
               "url": "https://git.kernel.org/stable/c/55e6d8037805b3400096d621091dfbf713f97e83"
            }
         ],
         "title": "regmap: Fix possible double-free in regcache_rbtree_exit()",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-47483",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}