USB: more u32 conversion after transfer_buffer_length and actual_length

transfer_buffer_length and actual_length have become unsigned, therefore some
additional conversion of local variables, function arguments and print
specifications is desired.

A test for a negative urb->transfer_buffer_length became obsolete; instead
we ensure that it does not exceed INT_MAX. Also, urb->actual_length is always
less than urb->transfer_buffer_length.

rh_string() does no longer return -EPIPE in the case of an unsupported ID.
Instead its only caller, rh_call_control() does the check.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

5 files changed, 18 insertions, 25 deletions

diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c
index d3883f639604..df3c539f652a 100644
--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -302,7 +302,7 @@ static struct async *async_getpending(struct dev_state *ps,
 
 static void snoop_urb(struct urb *urb, void __user *userurb)
 {
-        int j;
+        unsigned j;
         unsigned char *data = urb->transfer_buffer;
 
         if (!usbfs_snoop)
@@ -311,9 +311,9 @@ static void snoop_urb(struct urb *urb, void __user *userurb)
         dev_info(&urb->dev->dev, "direction=%s\n",
                         usb_urb_dir_in(urb) ? "IN" : "OUT");
         dev_info(&urb->dev->dev, "userurb=%p\n", userurb);
-        dev_info(&urb->dev->dev, "transfer_buffer_length=%d\n",
+        dev_info(&urb->dev->dev, "transfer_buffer_length=%u\n",
                  urb->transfer_buffer_length);
-        dev_info(&urb->dev->dev, "actual_length=%d\n", urb->actual_length);
+        dev_info(&urb->dev->dev, "actual_length=%u\n", urb->actual_length);
         dev_info(&urb->dev->dev, "data: ");
         for (j = 0; j < urb->transfer_buffer_length; ++j)
                 printk("%02x ", data[j]);
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 0eee32a65e23..81fa8506825d 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -279,9 +279,9 @@ static const u8 hs_rh_config_descriptor [] = {
  * helper routine for returning string descriptors in UTF-16LE
  * input can actually be ISO-8859-1; ASCII is its 7-bit subset
  */
-static int ascii2utf (char *s, u8 *utf, int utfmax)
+static unsigned ascii2utf(char *s, u8 *utf, int utfmax)
 {
-        int retval;
+        unsigned retval;
 
         for (retval = 0; *s && utfmax > 1; utfmax -= 2, retval += 2) {
                 *utf++ = *s++;
@@ -304,19 +304,15 @@ static int ascii2utf (char *s, u8 *utf, int utfmax)
  * Produces either a manufacturer, product or serial number string for the
  * virtual root hub device.
  */
-static int rh_string (
-        int             id,
-        struct usb_hcd  *hcd,
-        u8              *data,
-        int             len
-) {
+static unsigned rh_string(int id, struct usb_hcd *hcd, u8 *data, unsigned len)
+{
         char buf [100];
 
         // language ids
         if (id == 0) {
                 buf[0] = 4;    buf[1] = 3;      /* 4 bytes string data */
                 buf[2] = 0x09; buf[3] = 0x04;   /* MSFT-speak for "en-us" */
-                len = min (len, 4);
+                len = min_t(unsigned, len, 4);
                 memcpy (data, buf, len);
                 return len;
 
@@ -332,10 +328,7 @@ static int rh_string (
         } else if (id == 3) {
                 snprintf (buf, sizeof buf, "%s %s %s", init_utsname()->sysname,
                         init_utsname()->release, hcd->driver->description);
-
-        // unsupported IDs --> "protocol stall"
-        } else
-                return -EPIPE;
+        }
 
         switch (len) {          /* All cases fall through */
         default:
@@ -360,9 +353,8 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
         u8              tbuf [sizeof (struct usb_hub_descriptor)]
                 __attribute__((aligned(4)));
         const u8        *bufp = tbuf;
-        int             len = 0;
+        unsigned        len = 0;
         int             status;
-        int             n;
         u8              patch_wakeup = 0;
         u8              patch_protocol = 0;
 
@@ -456,10 +448,11 @@ static int rh_call_control (struct usb_hcd *hcd, struct urb *urb)
                                 patch_wakeup = 1;
                         break;
                 case USB_DT_STRING << 8:
-                        n = rh_string (wValue & 0xff, hcd, ubuf, wLength);
-                        if (n < 0)
+                        if ((wValue & 0xff) < 4)
+                                urb->actual_length = rh_string(wValue & 0xff,
+                                                hcd, ubuf, wLength);
+                        else /* unsupported IDs --> "protocol stall" */
                                 goto error;
-                        urb->actual_length = n;
                         break;
                 default:
                         goto error;
@@ -629,7 +622,7 @@ static int rh_queue_status (struct usb_hcd *hcd, struct urb *urb)
 {
         int             retval;
         unsigned long   flags;
-        int             len = 1 + (urb->dev->maxchild / 8);
+        unsigned        len = 1 + (urb->dev->maxchild / 8);
 
         spin_lock_irqsave (&hcd_root_hub_lock, flags);
         if (hcd->status_urb || urb->transfer_buffer_length < len) {
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 81eb3e6b6592..be86ae3f4088 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -392,7 +392,7 @@ static void hub_irq(struct urb *urb)
 {
         struct usb_hub *hub = urb->context;
         int status = urb->status;
-        int i;
+        unsigned i;
         unsigned long bits;
 
         switch (status) {
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 3922fa915ed2..293a30d78d24 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -59,7 +59,7 @@ static int usb_start_wait_urb(struct urb *urb, int timeout, int *actual_length)
                 retval = (ctx.status == -ENOENT ? -ETIMEDOUT : ctx.status);
 
                 dev_dbg(&urb->dev->dev,
-                        "%s timed out on ep%d%s len=%d/%d\n",
+                        "%s timed out on ep%d%s len=%u/%u\n",
                         current->comm,
                         usb_endpoint_num(&urb->ep->desc),
                         usb_urb_dir_in(urb) ? "in" : "out",
diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 7025d801f23a..3376055f36e7 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -370,7 +370,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
         }
 
         /* the I/O buffer must be mapped/unmapped, except when length=0 */
-        if (urb->transfer_buffer_length < 0)
+        if (urb->transfer_buffer_length > INT_MAX)
                 return -EMSGSIZE;
 
 #ifdef DEBUG