CVE-2025-68817 ksmbd: fix use-after-free in ksmbd_tree_connect_put under concurrency

[
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    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/smb/server/mgmt/tree_connect.c",
      "fs/smb/server/mgmt/tree_connect.h",
      "fs/smb/server/smb2pdu.c"
    ],
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    "programFiles": [
      "fs/smb/server/mgmt/tree_connect.c",
      "fs/smb/server/mgmt/tree_connect.h",
      "fs/smb/server/smb2pdu.c"
    ],
    "versions": [
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      {
        "version": "0",
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        "status": "unaffected",
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      {
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        "version": "6.19",
        "lessThanOrEqual": "*",
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        "versionType": "original_commit_for_fix"
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]