usb: gadget: f_hid: fix: Prevent accessing released memory

[ Upstream commit aa65d11aa008f4de58a9cee7e121666d9d68505e ]

When we unlock our spinlock to copy data to user we may get
disabled by USB host and free the whole list of completed out
requests including the one from which we are copying the data
to user memory.

To prevent from this let's remove our working element from
the list and place it back only if there is sth left when we
finish with it.

Fixes: 99c515005857 ("usb: gadget: hidg: register OUT INT endpoint for SET_REPORT")
Cc: stable@vger.kernel.org
Tested-by: David Lechner <david@lechnology.com>
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>

diff --git a/drivers/usb/gadget/function/f_hid.c b/drivers/usb/gadget/function/f_hid.c
index 466640afa7be5e6e673dcb36d0f4cb7825cd4811..4a7861022d209782b49dd2f9c7050120d0ff793a 100644 (file)
--- a/drivers/usb/gadget/function/f_hid.c
+++ b/drivers/usb/gadget/function/f_hid.c
@@ -223,6 +223,13 @@ static ssize_t f_hidg_read(struct file *file, char __user *buffer,
        /* pick the first one */
        list = list_first_entry(&hidg->completed_out_req,
                                struct f_hidg_req_list, list);
+
+       /*
+        * Remove this from list to protect it from beign free()
+        * while host disables our function
+        */
+       list_del(&list->list);
+
        req = list->req;
        count = min_t(unsigned int, count, req->actual - list->pos);
        spin_unlock_irqrestore(&hidg->spinlock, flags);
@@ -238,15 +245,20 @@ static ssize_t f_hidg_read(struct file *file, char __user *buffer,
         * call, taking into account its current read position.
         */
        if (list->pos == req->actual) {
-               spin_lock_irqsave(&hidg->spinlock, flags);
-               list_del(&list->list);
                kfree(list);
-               spin_unlock_irqrestore(&hidg->spinlock, flags);
 
                req->length = hidg->report_length;
                ret = usb_ep_queue(hidg->out_ep, req, GFP_KERNEL);
-               if (ret < 0)
+               if (ret < 0) {
+                       free_ep_req(hidg->out_ep, req);
                        return ret;
+               }
+       } else {
+               spin_lock_irqsave(&hidg->spinlock, flags);
+               list_add(&list->list, &hidg->completed_out_req);
+               spin_unlock_irqrestore(&hidg->spinlock, flags);
+
+               wake_up(&hidg->read_queue);
        }
 
        return count;
@@ -490,6 +502,7 @@ static void hidg_disable(struct usb_function *f)
 {
        struct f_hidg *hidg = func_to_hidg(f);
        struct f_hidg_req_list *list, *next;
+       unsigned long flags;
 
        usb_ep_disable(hidg->in_ep);
        hidg->in_ep->driver_data = NULL;
@@ -497,10 +510,13 @@ static void hidg_disable(struct usb_function *f)
        usb_ep_disable(hidg->out_ep);
        hidg->out_ep->driver_data = NULL;
 
+       spin_lock_irqsave(&hidg->spinlock, flags);
        list_for_each_entry_safe(list, next, &hidg->completed_out_req, list) {
+               free_ep_req(hidg->out_ep, list->req);
                list_del(&list->list);
                kfree(list);
        }
+       spin_unlock_irqrestore(&hidg->spinlock, flags);
 }
 
 static int hidg_set_alt(struct usb_function *f, unsigned intf, unsigned alt)