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Bluetooth: fix memory leak in error path of hci_alloc_dev()

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: fix memory leak in error path of hci_alloc_dev() Early failures in Bluetooth HCI UART configuration leak SRCU percpu memory. When device initialization fails before hci_register_dev() completes, the HCI_UNREGISTER flag is never set. As a result, when the device reference count reaches zero, bt_host_release() evaluates this flag as false and falls back to a direct kfree(hdev). Because hci_release_dev() is bypassed, the SRCU struct initialized early in hci_alloc_dev() is never cleaned up, resulting in a leak of percpu memory. Fix the leak by explicitly calling cleanup_srcu_struct() in the fallback (unregistered) branch of bt_host_release() before freeing the device.

Affected products

Linux
  • <5.11
  • <6.1.176
  • =<6.6.*
  • <6.16
  • <bc2efe73c194a74839d7cf57b63880d97e21d309
  • <5.15.210
  • =<6.18.*
  • ==0e5c144c557df910ab64d9c25d06399a9a735e65
  • ==6.16
  • <c016118b9e51eeaf5bc93850d4c455a3b583c0aa
  • <0622e527a31d4b44737fed5c1a2ac1fc2cfb5184
  • =<*
  • <6.12.94
  • =<6.1.*
  • ==dd4becd3fd4102696e1c15e6d260a1712a2d8685
  • <ce4b4cac3c5749b6aa75e62e2991ae2263f2f889
  • <6.6.143
  • <5b7dfca6f852e6b9d809fd0263b5427cc9fb33fd
  • =<5.15.*
  • =<6.12.*
  • =<7.0.*
  • <37b3009bf5976e8ab77c8b9a9bc3bbd7ff49e37f
  • <f82799407a50af7bcacacf09cc9b279af8fe9b81
  • <6.16