Messages in this thread Patch in this message | | | From | Michal Sojka <> | Subject | [PATCH] USB: Do not pass negative length to snoop_urb() | Date | Tue, 15 Mar 2011 16:41:47 +0100 |
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When `echo Y > /sys/module/usbcore/parameters/usbfs_snoop` and usb_control_msg() returns error, a lot of kernel memory is dumped to dmesg until unhandled kernel paging request occurs.
Signed-off-by: Michal Sojka <sojkam1@fel.cvut.cz> Cc: stable@kernel.org --- drivers/usb/core/devio.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index a7131ad..37518df 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -802,7 +802,7 @@ static int proc_control(struct dev_state *ps, void __user *arg) tbuf, ctrl.wLength, tmo); usb_lock_device(dev); snoop_urb(dev, NULL, pipe, max(i, 0), min(i, 0), COMPLETE, - tbuf, i); + tbuf, max(i, 0)); if ((i > 0) && ctrl.wLength) { if (copy_to_user(ctrl.data, tbuf, i)) { free_page((unsigned long)tbuf); -- 1.7.2.3
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