)]}'
{
  "commit": "cd5dd68267c4238795fadaf02b3575ca3f8a6500",
  "tree": "cf29dc84fc6d0c1cbece69f4e01f183a8db49ae2",
  "parents": [
    "907b978e82cb4c1c245fc2985bb27c5d5c88c8f6"
  ],
  "author": {
    "name": "Eric Dumazet",
    "email": "edumazet@google.com",
    "time": "Thu Sep 24 08:29:51 2026 +0000"
  },
  "committer": {
    "name": "Jakub Kicinski",
    "email": "kuba@kernel.org",
    "time": "Thu Sep 24 11:00:59 2026 -0700"
  },
  "message": "vlan: ensure sufficient headroom in vlan_dev_hard_header()\n\nCallers that only reserve ETH_HLEN or less (such as llc_alloc_frame()),\nor skbs allocated before dynamic device/headroom changes (e.g. toggling\nVLAN_FLAG_REORDER_HDR or bonding/team switching slaves), can reach\nvlan_dev_hard_header() with insufficient headroom and trigger\nskb_under_panic().\n\nUse skb_cow_head() in vlan_dev_hard_header() when VLAN_FLAG_REORDER_HDR\nis not set to ensure sufficient headroom for the VLAN header(s) and the\nunderlying device hard header.\n\nUse READ_ONCE() to read dev-\u003ehard_header_len and dev-\u003eneeded_headroom as\nthey can be updated concurrently under RTNL (e.g. in\nvlan_transfer_features()) while vlan_dev_hard_header() runs locklessly on\nthe transmit path. Also avoid LL_RESERVED_SPACE(dev) here so that the\nextra HH_DATA_MOD alignment padding does not trigger unnecessary\npskb_expand_head() reallocations on inner stacked VLAN devices after the\nouter VLAN header has been pushed.\n\nFixes: 1da177e4c3f4 (\"Linux-2.6.12-rc2\")\nReported-by: Zixuan Chai \u003cpetalzu987@gmail.com\u003e\nCloses: https://lore.kernel.org/netdev/cover.1789987105.git.petalzu987@gmail.com/\nLink: https://lore.kernel.org/netdev/179022851638.2160803.1808206741379444999@kernel.org/\nCc: Hangbin Liu \u003cliuhangbin@gmail.com\u003e\nSigned-off-by: Eric Dumazet \u003cedumazet@google.com\u003e\nLink: https://patch.msgid.link/20260924082951.1599377-5-edumazet@google.com\nSigned-off-by: Jakub Kicinski \u003ckuba@kernel.org\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "2859cbac3f266b7c4e3f44f41280d33ab69c5270",
      "old_mode": 33188,
      "old_path": "net/8021q/vlan_dev.c",
      "new_id": "c949c6a829456c2f75d6c514b35a85ff64c493d8",
      "new_mode": 33188,
      "new_path": "net/8021q/vlan_dev.c"
    }
  ]
}