1 files changed, 7 insertions, 1 deletions

diff --git a/drivers/usb/mon/mon_bin.c b/drivers/usb/mon/mon_bin.c
index f6ae753ab99b..f932f40302df 100644
--- a/drivers/usb/mon/mon_bin.c
+++ b/drivers/usb/mon/mon_bin.c
@@ -1004,7 +1004,9 @@ static long mon_bin_ioctl(struct file *file, unsigned int cmd, unsigned long arg
                 break;
 
         case MON_IOCQ_RING_SIZE:
+                mutex_lock(&rp->fetch_lock);
                 ret = rp->b_size;
+                mutex_unlock(&rp->fetch_lock);
                 break;
 
         case MON_IOCT_RING_SIZE:
@@ -1231,12 +1233,16 @@ static int mon_bin_vma_fault(struct vm_fault *vmf)
         unsigned long offset, chunk_idx;
         struct page *pageptr;
 
+        mutex_lock(&rp->fetch_lock);
         offset = vmf->pgoff << PAGE_SHIFT;
-        if (offset >= rp->b_size)
+        if (offset >= rp->b_size) {
+                mutex_unlock(&rp->fetch_lock);
                 return VM_FAULT_SIGBUS;
+        }
         chunk_idx = offset / CHUNK_SIZE;
         pageptr = rp->b_vec[chunk_idx].pg;
         get_page(pageptr);
+        mutex_unlock(&rp->fetch_lock);
         vmf->page = pageptr;
         return 0;
 }