f2fs: fix NULL pointer dereference in f2fs_submit_page_write()

{
  "id": "432f183179a624a000b14e4a05a0ac3ae3b4df6064df61ab804e38f49b44c2c2",
  "url": "https://osv.dev/vulnerability/CVE-2024-26871",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "f2fs: fix NULL pointer dereference in f2fs_submit_page_write()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: f2fs: fix NULL pointer dereference in f2fs_submit_page_write() BUG: kernel NULL pointer dereference, address: 0000000000000014 RIP: 0010:f2fs_submit_page_write+0x6cf/0x780 [f2fs] Call Trace: ? show_regs+0x6e/0x80 ? __die+0x29/0x70 ? page_fault_oops+0x154/0x4a0 ? prb_read_valid+0x20/0x30 ? __irq_work_queue_local+0x39/0xd0 ? irq_work_queue+0x36/0x70 ? do_user_addr_fault+0x314/0x6c0 ? exc_page_fault+0x7d/0x190 ? asm_exc_page_fault+0x2b/0x30 ? f2fs_submit_page_write+0x6cf/0x780 [f2fs] ? f2fs_submit_page_write+0x736/0x780 [f2fs] do_write_page+0x50/0x170 [f2fs] f2fs_outplace_write_data+0x61/0xb0 [f2fs] f2fs_do_write_data_page+0x3f8/0x660 [f2fs] f2fs_write_single_data_page+0x5bb/0x7a0 [f2fs] f2fs_write_cache_pages+0x3da/0xbe0 [f2fs] ... It is possible that other threads have added this fio to io->bio and submitted the io->bio before entering f2fs_submit_page_write(). At this point io->bio = NULL. If is_end_zone_blkaddr(sbi, fio->new_blkaddr) of this fio is true, then an NULL pointer dereference error occurs at bio_get(io->bio). The original code for determining zone end was after \"out:\", which would have missed some fio who is zone end. I've moved this code before \"skip:\" to make sure it's done for each fio.",
    "evidence": "osv:CVE-2024-26871",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.23",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.7.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.8.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-26871",
      "aliases": [
        "CVE-2024-26871"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e067dc3c6b9c419bac43c6a0be2d85f44681f863"
                },
                {
                  "fixed": "8e2ea8b04cb8d976110c4568509e67d6a39b2889"
                },
                {
                  "fixed": "4c122a32582b67bdd44ca8d25f894ee2dc54f566"
                },
                {
                  "fixed": "6d102382a11d5e6035f6c98f6e508a38541f7af3"
                },
                {
                  "fixed": "c2034ef6192a65a986a45c2aa2ed05824fdc0e9f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26871.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.5.0"
                },
                {
                  "fixed": "6.6.23"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.7.11"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.8.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26871.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.302207902Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4c122a32582b67bdd44ca8d25f894ee2dc54f566",
        "https://git.kernel.org/stable/c/6d102382a11d5e6035f6c98f6e508a38541f7af3",
        "https://git.kernel.org/stable/c/8e2ea8b04cb8d976110c4568509e67d6a39b2889",
        "https://git.kernel.org/stable/c/c2034ef6192a65a986a45c2aa2ed05824fdc0e9f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26871.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26871",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26871.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-26871",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 491783,
  "published_at": "2024-04-17T10:27:31.396+00:00"
}