3 files changed, 4 insertions, 3 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index fd2e26b6f966..85c52fd26bff 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -51,7 +51,6 @@
 #define HARD_MSGMAX     (131072/sizeof(void*))
 #define DFLT_MSGSIZEMAX 8192    /* max message size */
 
-#define NOTIFY_COOKIE_LEN       32
 
 struct ext_wait_queue {         /* queue of sleeping tasks */
         struct task_struct *task;
diff --git a/ipc/msg.c b/ipc/msg.c
index 8c30ec2f6e34..7eec5ed32379 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -220,8 +220,7 @@ asmlinkage long sys_msgget (key_t key, int msgflg)
                 ret = -EEXIST;
         } else {
                 msq = msg_lock(id);
-                if(msq==NULL)
-                        BUG();
+                BUG_ON(msq==NULL);
                 if (ipcperms(&msq->q_perm, msgflg))
                         ret = -EACCES;
                 else {
diff --git a/ipc/shm.c b/ipc/shm.c
index a88c8a02e7f3..6f9615c09fb2 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -814,6 +814,9 @@ asmlinkage long sys_shmdt(char __user *shmaddr)
         loff_t size = 0;
         int retval = -EINVAL;
 
+        if (addr & ~PAGE_MASK)
+                return retval;
+
         down_write(&mm->mmap_sem);
 
         /*