Bluetooth: hci_uart: check for missing tty operations
Certain ttys operations (pty_unix98_ops) lack tiocmget() and tiocmset() functions which are called by the certain HCI UART protocols (hci_ath, hci_bcm, hci_intel, hci_mrvl, hci_qca) via hci_uart_set_flow_control() or directly. This leads to an execution at NULL and can be triggered by an unprivileged user. Fix this by adding a helper function and a check for the missing tty operations in the protocols code. This fixes CVE-2019-10207. The Fixes: lines list commits where calls to tiocm[gs]et() or hci_uart_set_flow_control() were added to the HCI UART protocols. Link: https://syzkaller.appspot.com/bug?id=1b42faa2848963564a5b1b7f8c837ea7b55ffa50 Reported-by: syzbot+79337b501d6aa974d0f6@syzkaller.appspotmail.com Cc: stable@vger.kernel.org # v2.6.36+ Fixes: b3190df6 ("Bluetooth: Support for Atheros AR300x serial chip") Fixes: 118612fb ("Bluetooth: hci_bcm: Add suspend/resume PM functions") Fixes: ff289559 ("Bluetooth: hci_intel: Add Intel baudrate configuration support") Fixes: 162f812f ("Bluetooth: hci_uart: Add Marvell support") Fixes: fa9ad876 ("Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990") Signed-off-by: NVladis Dronov <vdronov@redhat.com> Signed-off-by: NMarcel Holtmann <marcel@holtmann.org> Reviewed-by: NYu-Chen, Cho <acho@suse.com> Tested-by: NYu-Chen, Cho <acho@suse.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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