This is a note to let you know that I've just added the patch titled USB: devio: Don't corrupt user memory to the 4.13-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: usb-devio-don-t-corrupt-user-memory.patch and it can be found in the queue-4.13 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From fa1ed74eb1c233be6131ec92df21ab46499a15b6 Mon Sep 17 00:00:00 2001 From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Date: Fri, 22 Sep 2017 23:43:46 +0300 Subject: USB: devio: Don't corrupt user memory From: Dan Carpenter <dan.carpenter@xxxxxxxxxx> commit fa1ed74eb1c233be6131ec92df21ab46499a15b6 upstream. The user buffer has "uurb->buffer_length" bytes. If the kernel has more information than that, we should truncate it instead of writing past the end of the user's buffer. I added a WARN_ONCE() to help the user debug the issue. Reported-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/core/devio.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1576,7 +1576,11 @@ static int proc_do_submiturb(struct usb_ totlen += isopkt[u].length; } u *= sizeof(struct usb_iso_packet_descriptor); - uurb->buffer_length = totlen; + if (totlen <= uurb->buffer_length) + uurb->buffer_length = totlen; + else + WARN_ONCE(1, "uurb->buffer_length is too short %d vs %d", + totlen, uurb->buffer_length); break; default: Patches currently in stable-queue which might be from dan.carpenter@xxxxxxxxxx are queue-4.13/usb-devio-prevent-integer-overflow-in-proc_do_submiturb.patch queue-4.13/sctp-potential-read-out-of-bounds-in-sctp_ulpevent_type_enabled.patch queue-4.13/usb-devio-don-t-corrupt-user-memory.patch