{
   "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: check discard support for conventional zones\n\nAs the helper function f2fs_bdev_support_discard() shows, f2fs checks if\nthe target block devices support discard by calling\nbdev_max_discard_sectors() and bdev_is_zoned(). This check works well\nfor most cases, but it does not work for conventional zones on zoned\nblock devices. F2fs assumes that zoned block devices support discard,\nand calls __submit_discard_cmd(). When __submit_discard_cmd() is called\nfor sequential write required zones, it works fine since\n__submit_discard_cmd() issues zone reset commands instead of discard\ncommands. However, when __submit_discard_cmd() is called for\nconventional zones, __blkdev_issue_discard() is called even when the\ndevices do not support discard.\n\nThe inappropriate __blkdev_issue_discard() call was not a problem before\nthe commit 30f1e7241422 (\"block: move discard checks into the ioctl\nhandler\") because __blkdev_issue_discard() checked if the target devices\nsupport discard or not. If not, it returned EOPNOTSUPP. After the\ncommit, __blkdev_issue_discard() no longer checks it. It always returns\nzero and sets NULL to the given bio pointer. This NULL pointer triggers\nf2fs_bug_on() in __submit_discard_cmd(). The BUG is recreated with the\ncommands below at the umount step, where /dev/nullb0 is a zoned null_blk\nwith 5GB total size, 128MB zone size and 10 conventional zones.\n\n$ mkfs.f2fs -f -m /dev/nullb0\n$ mount /dev/nullb0 /mnt\n$ for ((i=0;i<5;i++)); do dd if=/dev/zero of=/mnt/test bs=65536 count=1600 conv=fsync; done\n$ umount /mnt\n\nTo fix the BUG, avoid the inappropriate __blkdev_issue_discard() call.\nWhen discard is requested for conventional zones, check if the device\nsupports discard or not. If not, return EOPNOTSUPP."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "fs/f2fs/segment.c"
               ],
               "versions": [
                  {
                     "version": "30f1e7241422",
                     "lessThan": "7bd7ce68ddad",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "30f1e7241422",
                     "lessThan": "d2352b57897f",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "30f1e7241422",
                     "lessThan": "43aec4d01bd2",
                     "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/segment.c"
               ],
               "versions": [
                  {
                     "version": "6.10",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "6.10",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.10.13",
                     "lessThanOrEqual": "6.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.11.2",
                     "lessThanOrEqual": "6.11.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.12-rc1",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/7bd7ce68ddad5a28565e42ef21cacaff113773a9"
            },
            {
               "url": "https://git.kernel.org/stable/c/d2352b57897f6a3349666fc318dcbec99092c6a5"
            },
            {
               "url": "https://git.kernel.org/stable/c/43aec4d01bd2ce961817a777b3846f8318f398e4"
            }
         ],
         "title": "f2fs: check discard support for conventional zones",
         "x_generator": {
            "engine": "bippy-c9c4e1df01b2"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-47680",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}