1 files changed, 5 insertions, 1 deletions

diff --git a/fs/compat.c b/fs/compat.c
index 8c665705c6a0..ac3fb9ed8eea 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1619,6 +1619,7 @@ compat_sys_select(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp
         char *bits;
         long timeout;
         int size, max_fdset, ret = -EINVAL;
+        struct fdtable *fdt;
 
         timeout = MAX_SCHEDULE_TIMEOUT;
         if (tvp) {
@@ -1644,7 +1645,10 @@ compat_sys_select(int n, compat_ulong_t __user *inp, compat_ulong_t __user *outp
                 goto out_nofds;
 
         /* max_fdset can increase, so grab it once to avoid race */
-        max_fdset = current->files->max_fdset;
+        rcu_read_lock();
+        fdt = files_fdtable(current->files);
+        max_fdset = fdt->max_fdset;
+        rcu_read_unlock();
         if (n > max_fdset)
                 n = max_fdset;