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Bluetooth: hci_sync: extend conn_hash lookup critical sections

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: extend conn_hash lookup critical sections Using RCU-protected pointers outside the critical sections without refcount is incorrect and may result to UAF. Extend critical section to cover both hci_conn_hash lookup and use of the returned conn. Add surrounding rcu_read_lock() also when return value is not used, in preparation for RCU lockdep requirement to hci_lookup_le_connect(). This avoids concurrent deletion of the conn before we are done dereferencing it. Also, make sure to hold hdev->lock when accessing hdev->accept_list.

Affected products

Linux
  • <38326774df6198df0cc2744cc73bf77cb741c538
  • ==94bf6380e936339a700c0b3171a49baf512aa70b
  • <6.13
  • =<*
  • <6.15
  • <d5efd6e4b8b0634af6843178fe1a7dd2b2178a3d
  • ==6.15
  • <83b7e67698d0b93f685875ce82c8d335436834f7
  • <6.15
  • =<6.18.*
  • =<7.1.*
  • ==eb8b860e87b296bd1874c79a668081efd00f9754