1 files changed, 2 insertions, 0 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 54b4077fed79..a8ddadbc7459 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1156,10 +1156,12 @@ SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes,
         omqstat.mq_flags = filp->f_flags & O_NONBLOCK;
         if (u_mqstat) {
                 audit_mq_getsetattr(mqdes, &mqstat);
+                spin_lock(&filp->f_lock);
                 if (mqstat.mq_flags & O_NONBLOCK)
                         filp->f_flags |= O_NONBLOCK;
                 else
                         filp->f_flags &= ~O_NONBLOCK;
+                spin_unlock(&filp->f_lock);
 
                 inode->i_atime = inode->i_ctime = CURRENT_TIME;
         }