Commit 57999d11 authored by Dan Carpenter's avatar Dan Carpenter Committed by Greg Kroah-Hartman

USB: devio: Prevent integer overflow in proc_do_submiturb()

There used to be an integer overflow check in proc_do_submiturb() but
we removed it.  It turns out that it's still required.  The
uurb->buffer_length variable is a signed integer and it's controlled by
the user.  It can lead to an integer overflow when we do:

	num_sgs = DIV_ROUND_UP(uurb->buffer_length, USB_SG_SIZE);

If we strip away the macro then that line looks like this:

	num_sgs = (uurb->buffer_length + USB_SG_SIZE - 1) / USB_SG_SIZE;
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
It's the first addition which can overflow.

Fixes: 1129d270 ("USB: Increase usbfs transfer limit")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 1fbbb78f
...@@ -140,6 +140,9 @@ module_param(usbfs_memory_mb, uint, 0644); ...@@ -140,6 +140,9 @@ module_param(usbfs_memory_mb, uint, 0644);
MODULE_PARM_DESC(usbfs_memory_mb, MODULE_PARM_DESC(usbfs_memory_mb,
"maximum MB allowed for usbfs buffers (0 = no limit)"); "maximum MB allowed for usbfs buffers (0 = no limit)");
/* Hard limit, necessary to avoid arithmetic overflow */
#define USBFS_XFER_MAX (UINT_MAX / 2 - 1000000)
static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */ static atomic64_t usbfs_memory_usage; /* Total memory currently allocated */
/* Check whether it's okay to allocate more memory for a transfer */ /* Check whether it's okay to allocate more memory for a transfer */
...@@ -1460,6 +1463,8 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb ...@@ -1460,6 +1463,8 @@ static int proc_do_submiturb(struct usb_dev_state *ps, struct usbdevfs_urb *uurb
USBDEVFS_URB_ZERO_PACKET | USBDEVFS_URB_ZERO_PACKET |
USBDEVFS_URB_NO_INTERRUPT)) USBDEVFS_URB_NO_INTERRUPT))
return -EINVAL; return -EINVAL;
if ((unsigned int)uurb->buffer_length >= USBFS_XFER_MAX)
return -EINVAL;
if (uurb->buffer_length > 0 && !uurb->buffer) if (uurb->buffer_length > 0 && !uurb->buffer)
return -EINVAL; return -EINVAL;
if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL && if (!(uurb->type == USBDEVFS_URB_TYPE_CONTROL &&
......
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