bpf: Fix a btf decl_tag bug when tagging a function

{
  "id": "c16640de0b94146720676c21f9971bf184a02bd4449d4ede8a62c6a2997e5d82",
  "url": "https://osv.dev/vulnerability/CVE-2022-49228",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "bpf: Fix a btf decl_tag bug when tagging a function",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a btf decl_tag bug when tagging a function syzbot reported a btf decl_tag bug with stack trace below: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 0 PID: 3592 Comm: syz-executor914 Not tainted 5.16.0-syzkaller-11424-gb7892f7d5cb2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:btf_type_vlen include/linux/btf.h:231 [inline] RIP: 0010:btf_decl_tag_resolve+0x83e/0xaa0 kernel/bpf/btf.c:3910 ... Call Trace: btf_resolve+0x251/0x1020 kernel/bpf/btf.c:4198 btf_check_all_types kernel/bpf/btf.c:4239 [inline] btf_parse_type_sec kernel/bpf/btf.c:4280 [inline] btf_parse kernel/bpf/btf.c:4513 [inline] btf_new_fd+0x19fe/0x2370 kernel/bpf/btf.c:6047 bpf_btf_load kernel/bpf/syscall.c:4039 [inline] __sys_bpf+0x1cbb/0x5970 kernel/bpf/syscall.c:4679 __do_sys_bpf kernel/bpf/syscall.c:4738 [inline] __se_sys_bpf kernel/bpf/syscall.c:4736 [inline] __x64_sys_bpf+0x75/0xb0 kernel/bpf/syscall.c:4736 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The kasan error is triggered with an illegal BTF like below: type 0: void type 1: int type 2: decl_tag to func type 3 type 3: func to func_proto type 8 The total number of types is 4 and the type 3 i",
    "evidence": "osv:CVE-2022-49228",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.16.19",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.17.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-49228",
      "aliases": [
        "CVE-2022-49228"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "b5ea834dde6b6e7f75e51d5f66dac8cd7c97b5ef"
                },
                {
                  "fixed": "a3bcd2110c087bc62e90fddd4a93237b049d6e68"
                },
                {
                  "fixed": "796d5666f6422ddadc938fb888044fcc16f2dbe3"
                },
                {
                  "fixed": "d7e7b42f4f956f2c68ad8cda87d750093dbba737"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49228.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "5.16.19"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "5.17.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49228.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.144918002Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/796d5666f6422ddadc938fb888044fcc16f2dbe3",
        "https://git.kernel.org/stable/c/a3bcd2110c087bc62e90fddd4a93237b049d6e68",
        "https://git.kernel.org/stable/c/d7e7b42f4f956f2c68ad8cda87d750093dbba737",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49228.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49228",
        "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/2022/49xxx/CVE-2022-49228.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49228",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493623,
  "published_at": "2025-02-26T01:55:56.682+00:00"
}