On Mon, Oct 16, 2023 at 10:09:30AM +0200, Ricardo Cañuelo wrote: > Many functions in drivers/usb/core/hub.c and drivers/usb/core/hub.h > access fields inside udev->bos without checking if it was allocated and > initialized. If usb_get_bos_descriptor() fails for whatever > reason, udev->bos will be NULL and those accesses will result in a > crash: > > BUG: kernel NULL pointer dereference, address: 0000000000000018 > PGD 0 P4D 0 > Oops: 0000 [#1] PREEMPT SMP NOPTI > CPU: 5 PID: 17818 Comm: kworker/5:1 Tainted: G W 5.15.108-18910-gab0e1cb584e1 #1 <HASH:1f9e 1> > Hardware name: Google Kindred/Kindred, BIOS Google_Kindred.12672.413.0 02/03/2021 > Workqueue: usb_hub_wq hub_event > RIP: 0010:hub_port_reset+0x193/0x788 > Code: 89 f7 e8 20 f7 15 00 48 8b 43 08 80 b8 96 03 00 00 03 75 36 0f b7 88 92 03 00 00 81 f9 10 03 00 00 72 27 48 8b 80 a8 03 00 00 <48> 83 78 18 00 74 19 48 89 df 48 8b 75 b0 ba 02 00 00 00 4c 89 e9 > RSP: 0018:ffffab740c53fcf8 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffffa1bc5f678000 RCX: 0000000000000310 > RDX: fffffffffffffdff RSI: 0000000000000286 RDI: ffffa1be9655b840 > RBP: ffffab740c53fd70 R08: 00001b7d5edaa20c R09: ffffffffb005e060 > R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 > R13: ffffab740c53fd3e R14: 0000000000000032 R15: 0000000000000000 > FS: 0000000000000000(0000) GS:ffffa1be96540000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000018 CR3: 000000022e80c005 CR4: 00000000003706e0 > Call Trace: > hub_event+0x73f/0x156e > ? hub_activate+0x5b7/0x68f > process_one_work+0x1a2/0x487 > worker_thread+0x11a/0x288 > kthread+0x13a/0x152 > ? process_one_work+0x487/0x487 > ? kthread_associate_blkcg+0x70/0x70 > ret_from_fork+0x1f/0x30 > > Fall back to a default behavior if the BOS descriptor isn't accessible > and skip all the functionalities that depend on it: LPM support checks, > Super Speed capabilitiy checks, U1/U2 states setup. > > Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@xxxxxxxxxxxxx> > Cc: stable <stable@xxxxxxxxxxxxxxx> > Link: https://lore.kernel.org/r/20230830100418.1952143-1-ricardo.canuelo@xxxxxxxxxxxxx > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > (cherry picked from commit f74a7afc224acd5e922c7a2e52244d891bbe44ee) > --- > drivers/usb/core/hub.c | 25 ++++++++++++++++++++++--- > drivers/usb/core/hub.h | 2 +- > 2 files changed, 23 insertions(+), 4 deletions(-) Now queued up, thanks. greg k-h
