vfs: don't copy things to user space holding the rcu readlock

[platform/adaptation/renesas_rcar/renesas_kernel.git] / fs / dcache.c

diff --git a/fs/dcache.c b/fs/dcache.c
index 99d4d72..29d5821 100644 (file)
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -3067,6 +3067,7 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size)
                prepend(&cwd, &buflen, "\0", 1);
                error = prepend_path(&pwd, &root, &cwd, &buflen);
                br_read_unlock(&vfsmount_lock);
+               rcu_read_unlock();
 
                if (error < 0)
                        goto out;
@@ -3087,10 +3088,10 @@ SYSCALL_DEFINE2(getcwd, char __user *, buf, unsigned long, size)
                }
        } else {
                br_read_unlock(&vfsmount_lock);
+               rcu_read_unlock();
        }
 
 out:
-       rcu_read_unlock();
        free_page((unsigned long) page);
        return error;
 }