1 files changed, 13 insertions, 6 deletions

diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
index a3a2e9c1639b..df0c4f605a21 100644
--- a/drivers/infiniband/core/umem.c
+++ b/drivers/infiniband/core/umem.c
@@ -105,6 +105,7 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
         umem->length    = size;
         umem->offset    = addr & ~PAGE_MASK;
         umem->page_size = PAGE_SIZE;
+        umem->pid       = get_task_pid(current, PIDTYPE_PID);
         /*
          * We ask for writable memory if any access flags other than
          * "remote read" are set.  "Local write" and "remote write"
@@ -198,6 +199,7 @@ out:
         if (ret < 0) {
                 if (need_release)
                         __ib_umem_release(context->device, umem, 0);
+                put_pid(umem->pid);
                 kfree(umem);
         } else
                 current->mm->pinned_vm = locked;
@@ -230,15 +232,19 @@ void ib_umem_release(struct ib_umem *umem)
 {
         struct ib_ucontext *context = umem->context;
         struct mm_struct *mm;
+        struct task_struct *task;
         unsigned long diff;
 
         __ib_umem_release(umem->context->device, umem, 1);
 
-        mm = get_task_mm(current);
-        if (!mm) {
-                kfree(umem);
-                return;
-        }
+        task = get_pid_task(umem->pid, PIDTYPE_PID);
+        put_pid(umem->pid);
+        if (!task)
+                goto out;
+        mm = get_task_mm(task);
+        put_task_struct(task);
+        if (!mm)
+                goto out;
 
         diff = PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT;
 
@@ -262,9 +268,10 @@ void ib_umem_release(struct ib_umem *umem)
         } else
                 down_write(&mm->mmap_sem);
 
-        current->mm->pinned_vm -= diff;
+        mm->pinned_vm -= diff;
         up_write(&mm->mmap_sem);
         mmput(mm);
+out:
         kfree(umem);
 }
 EXPORT_SYMBOL(ib_umem_release);