Hi Jeremy, > The hci_dev struct hdev is referenced in work queues and timers started > by open() in some protocols. This creates a race between the > initialization function and the work or timer which can result hdev > being dereferenced while it is still null. > > The syzbot report contains a reliable reproducer which causes a null > pointer dereference of hdev in hci_uart_write_work() by making the > memory allocation for hdev fail. > > To fix this, ensure hdev is valid from before calling a protocol's > open() until after calling a protocol's close(). > > Reported-by: syzbot+257790c15bcdef6fe00c@xxxxxxxxxxxxxxxxxxxxxxxxx > Signed-off-by: Jeremy Cline <jcline@xxxxxxxxxx> > --- > drivers/bluetooth/hci_ldisc.c | 21 ++++++++++++++------- > 1 file changed, 14 insertions(+), 7 deletions(-) patch has been applied to bluetooth-next tree. Regards Marcel
