orangefs: fix xattr related buffer overflow...

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  "url": "https://osv.dev/vulnerability/CVE-2025-40306",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "orangefs: fix xattr related buffer overflow...",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: orangefs: fix xattr related buffer overflow... Willy Tarreau forwarded me a message from Disclosure with the following warning: > The helper `xattr_key()` uses the pointer variable in the loop condition > rather than dereferencing it. As `key` is incremented, it remains non-NULL > (until it runs into unmapped memory), so the loop does not terminate on > valid C strings and will walk memory indefinitely, consuming CPU or hanging > the thread. I easily reproduced this with setfattr and getfattr, causing a kernel oops, hung user processes and corrupted orangefs files. Disclosure sent along a diff (not a patch) with a suggested fix, which I based this patch on. After xattr_key started working right, xfstest generic/069 exposed an xattr related memory leak that lead to OOM. xattr_key returns a hashed key. When adding xattrs to the orangefs xattr cache, orangefs used hash_add, a kernel hashing macro. hash_add also hashes the key using hash_log which resulted in additions to the xattr cache going to the wrong hash bucket. generic/069 tortures a single file and orangefs does a getattr for the xattr \"security.capability\" every time. Orangefs negative caches on xattrs which includes a kmalloc. Since adds to the xattr cache were going to the wrong bucket, every getattr for \"security.capability\" resulted in another kmalloc, none of which were ever freed. I changed the two uses of hash_add to hlist_add_head instead and th",
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      "modified": "2026-10-28T02:30:35.057635506Z",
      "provider": "osv",
      "references": [
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        "https://git.kernel.org/stable/c/15afebb9597449c444801d1ff0b8d8b311f950ab",
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  "source_id": "core-osv",
  "document_id": 502154,
  "published_at": "2025-12-08T00:46:31.514+00:00"
}