From de81d402f12a3492400644024e694748d3514951 Mon Sep 17 00:00:00 2001 From: Vijayavardhan Vennapusa Date: Thu, 5 May 2016 14:37:08 +0530 Subject: USB: dwc3: debugfs: Add boundary check in dwc3_store_ep_num() User can pass arguments as part of write to requests and endpoint number will be calculated based on the arguments. There is a chance that driver can access ep structue that is not allocated due to invalid arguments passed by user. Hence fix the issue by having check and return error in case of invalid arguments. Change-Id: I060ea878b55ce0f9983b91c50e58718c8a2c2fa1 Signed-off-by: Vijayavardhan Vennapusa --- drivers/usb/dwc3/debugfs.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/drivers/usb/dwc3/debugfs.c b/drivers/usb/dwc3/debugfs.c index 7a88671..c82647f 100644 --- a/drivers/usb/dwc3/debugfs.c +++ b/drivers/usb/dwc3/debugfs.c @@ -630,7 +630,7 @@ static ssize_t dwc3_store_ep_num(struct file *file, const char __user *ubuf, struct seq_file *s = file->private_data; struct dwc3 *dwc = s->private; char kbuf[10]; - unsigned int num, dir; + unsigned int num, dir, temp; unsigned long flags; memset(kbuf, 0, 10); @@ -641,8 +641,16 @@ static ssize_t dwc3_store_ep_num(struct file *file, const char __user *ubuf, if (sscanf(kbuf, "%u %u", &num, &dir) != 2) return -EINVAL; + if (dir != 0 && dir != 1) + return -EINVAL; + + temp = (num << 1) + dir; + if (temp >= (dwc->num_in_eps + dwc->num_out_eps) || + temp >= DWC3_ENDPOINTS_NUM) + return -EINVAL; + spin_lock_irqsave(&dwc->lock, flags); - ep_num = (num << 1) + dir; + ep_num = temp; spin_unlock_irqrestore(&dwc->lock, flags); return count; -- cgit v1.1