This is a note to let you know that I've just added the patch titled USB: fix linked-list corruption in rh_call_control() to the 4.4-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-fix-linked-list-corruption-in-rh_call_control.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 1633682053a7ee8058e10c76722b9b28e97fb73f Mon Sep 17 00:00:00 2001 From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Date: Fri, 24 Mar 2017 13:38:28 -0400 Subject: USB: fix linked-list corruption in rh_call_control() From: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> commit 1633682053a7ee8058e10c76722b9b28e97fb73f upstream. Using KASAN, Dmitry found a bug in the rh_call_control() routine: If buffer allocation fails, the routine returns immediately without unlinking its URB from the control endpoint, eventually leading to linked-list corruption. This patch fixes the problem by jumping to the end of the routine (where the URB is unlinked) when an allocation failure occurs. Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Reported-and-tested-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/usb/core/hcd.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/drivers/usb/core/hcd.c +++ b/drivers/usb/core/hcd.c @@ -499,8 +499,10 @@ static int rh_call_control (struct usb_h */ tbuf_size = max_t(u16, sizeof(struct usb_hub_descriptor), wLength); tbuf = kzalloc(tbuf_size, GFP_KERNEL); - if (!tbuf) - return -ENOMEM; + if (!tbuf) { + status = -ENOMEM; + goto err_alloc; + } bufp = tbuf; @@ -705,6 +707,7 @@ error: } kfree(tbuf); + err_alloc: /* any errors get returned through the urb completion */ spin_lock_irq(&hcd_root_hub_lock); Patches currently in stable-queue which might be from stern@xxxxxxxxxxxxxxxxxxx are queue-4.4/usb-fix-linked-list-corruption-in-rh_call_control.patch