dm raid: fix address sanitizer warning in raid_status

{
  "id": "541965b45039e071ef8ed503662b705970a9d951b162c4213a1eee82ab5e7450",
  "url": "https://osv.dev/vulnerability/CVE-2022-50084",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dm raid: fix address sanitizer warning in raid_status",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dm raid: fix address sanitizer warning in raid_status There is this warning when using a kernel with the address sanitizer and running this testsuite: https://gitlab.com/cki-project/kernel-tests/-/tree/main/storage/swraid/scsi_raid ================================================================== BUG: KASAN: slab-out-of-bounds in raid_status+0x1747/0x2820 [dm_raid] Read of size 4 at addr ffff888079d2c7e8 by task lvcreate/13319 CPU: 0 PID: 13319 Comm: lvcreate Not tainted 5.18.0-0.rc3. #1 Hardware name: Red Hat KVM, BIOS 0.5.1 01/01/2011 Call Trace: dump_stack_lvl+0x6a/0x9c print_address_description.constprop.0+0x1f/0x1e0 print_report.cold+0x55/0x244 kasan_report+0xc9/0x100 raid_status+0x1747/0x2820 [dm_raid] dm_ima_measure_on_table_load+0x4b8/0xca0 [dm_mod] table_load+0x35c/0x630 [dm_mod] ctl_ioctl+0x411/0x630 [dm_mod] dm_ctl_ioctl+0xa/0x10 [dm_mod] __x64_sys_ioctl+0x12a/0x1a0 do_syscall_64+0x5b/0x80 The warning is caused by reading conf->max_nr_stripes in raid_status. The code in raid_status reads mddev->private, casts it to struct r5conf and reads the entry max_nr_stripes. However, if we have different raid type than 4/5/6, mddev->private doesn't point to struct r5conf; it may point to struct r0conf, struct r1conf, struct r10conf or struct mpconf. If we cast a pointer to one of these structs to struct r5conf, we will be reading invalid memory and KASAN warns about it. Fix this bug by reading struct r5conf ",
    "evidence": "osv:CVE-2022-50084",
    "products": [
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    "severity": "unknown",
    "structured": {
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      "aliases": [
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      "modified": "2026-10-28T02:30:23.960768908Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/1ae0ebfb576b72c2ef400917a5484ebe7892d80b",
        "https://git.kernel.org/stable/c/1fbeea217d8f297fe0e0956a1516d14ba97d0396",
        "https://git.kernel.org/stable/c/49dba30638e091120256a9e89125340795f034dc",
        "https://git.kernel.org/stable/c/4c233811a49578634d10a5e70a9dfa569d451e94",
        "https://git.kernel.org/stable/c/90b006da40dd42285b24dd3c940d2c32aca9a70b",
        "https://git.kernel.org/stable/c/b4c6c07c92b6cba2bf3cb2dfa722debeaf8a8abe",
        "https://git.kernel.org/stable/c/b856ce5f4b55f752144baf17e9d5c415072652c5",
        "https://git.kernel.org/stable/c/cb583ca6125ac64c98e9d65128e95ebb5be7d322",
        "https://git.kernel.org/stable/c/d8971b595d7adac3421c21f59918241f1574061e",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50084.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50084",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 490335,
  "published_at": "2025-06-18T11:02:25.998+00:00"
}