{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix panic during f2fs_resize_fs()\n\nf2fs_resize_fs() hangs in below callstack with testcase:\n- mkfs 16GB image & mount image\n- dd 8GB fileA\n- dd 8GB fileB\n- sync\n- rm fileA\n- sync\n- resize filesystem to 8GB\n\nkernel BUG at segment.c:2484!\nCall Trace:\n allocate_segment_by_default+0x92/0xf0 [f2fs]\n f2fs_allocate_data_block+0x44b/0x7e0 [f2fs]\n do_write_page+0x5a/0x110 [f2fs]\n f2fs_outplace_write_data+0x55/0x100 [f2fs]\n f2fs_do_write_data_page+0x392/0x850 [f2fs]\n move_data_page+0x233/0x320 [f2fs]\n do_garbage_collect+0x14d9/0x1660 [f2fs]\n free_segment_range+0x1f7/0x310 [f2fs]\n f2fs_resize_fs+0x118/0x330 [f2fs]\n __f2fs_ioctl+0x487/0x3680 [f2fs]\n __x64_sys_ioctl+0x8e/0xd0\n do_syscall_64+0x33/0x80\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nThe root cause is we forgot to check that whether we have enough space\nin resized filesystem to store all valid blocks in before-resizing\nfilesystem, then allocator will run out-of-space during block migration\nin free_segment_range()."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/f2fs/gc.c"
               ],
               "versions": [
                  {
                     "version": "b4b10061ef98",
                     "lessThan": "1c20a4896409",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "b4b10061ef98",
                     "lessThan": "860afd680d9c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "b4b10061ef98",
                     "lessThan": "822054e5026c",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "b4b10061ef98",
                     "lessThan": "3ab0598e6d86",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/f2fs/gc.c"
               ],
               "versions": [
                  {
                     "version": "5.8",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.8",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.38",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.11.22",
                     "lessThanOrEqual": "5.11.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.12.5",
                     "lessThanOrEqual": "5.12.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.13",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/1c20a4896409f5ca1c770e1880c33d0a28a8b10f"
            },
            {
               "url": "https://git.kernel.org/stable/c/860afd680d9cc1dabd61cda3cd246f60aa1eb705"
            },
            {
               "url": "https://git.kernel.org/stable/c/822054e5026c43b1dd60cf387dd999e95ee2ecc2"
            },
            {
               "url": "https://git.kernel.org/stable/c/3ab0598e6d860ef49d029943ba80f627c15c15d6"
            }
         ],
         "title": "f2fs: fix panic during f2fs_resize_fs()",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2021-47007",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}