1 files changed, 18 insertions, 13 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index 38a055758a9b..d0ab5527bf45 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -75,7 +75,7 @@ void shm_init_ns(struct ipc_namespace *ns)
 	ns->shm_ctlall = SHMALL;
 	ns->shm_ctlmni = SHMMNI;
 	ns->shm_tot = 0;
-	ipc_init_ids(&ns->ids[IPC_SHM_IDS]);
+	ipc_init_ids(&shm_ids(ns));
 }
 
 /*
@@ -644,7 +644,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
 		if (err)
 			return err;
 
-		memset(&shminfo,0,sizeof(shminfo));
+		memset(&shminfo, 0, sizeof(shminfo));
 		shminfo.shmmni = shminfo.shmseg = ns->shm_ctlmni;
 		shminfo.shmmax = ns->shm_ctlmax;
 		shminfo.shmall = ns->shm_ctlall;
@@ -669,7 +669,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
 		if (err)
 			return err;
 
-		memset(&shm_info,0,sizeof(shm_info));
+		memset(&shm_info, 0, sizeof(shm_info));
 		down_read(&shm_ids(ns).rw_mutex);
 		shm_info.used_ids = shm_ids(ns).in_use;
 		shm_get_stat (ns, &shm_info.shm_rss, &shm_info.shm_swp);
@@ -678,7 +678,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
 		shm_info.swap_successes = 0;
 		err = ipc_get_maxid(&shm_ids(ns));
 		up_read(&shm_ids(ns).rw_mutex);
-		if(copy_to_user (buf, &shm_info, sizeof(shm_info))) {
+		if (copy_to_user(buf, &shm_info, sizeof(shm_info))) {
 			err = -EFAULT;
 			goto out;
 		}
@@ -692,11 +692,6 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
 		struct shmid64_ds tbuf;
 		int result;
 
-		if (!buf) {
-			err = -EFAULT;
-			goto out;
-		}
-
 		if (cmd == SHM_STAT) {
 			shp = shm_lock(ns, shmid);
 			if (IS_ERR(shp)) {
@@ -712,7 +707,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
 			}
 			result = 0;
 		}
-		err=-EACCES;
+		err = -EACCES;
 		if (ipcperms (&shp->shm_perm, S_IRUGO))
 			goto out_unlock;
 		err = security_shm_shmctl(shp, cmd);
@@ -747,9 +742,7 @@ asmlinkage long sys_shmctl(int shmid, int cmd, struct shmid_ds __user *buf)
 			goto out;
 		}
 
-		err = audit_ipc_obj(&(shp->shm_perm));
-		if (err)
-			goto out_unlock;
+		audit_ipc_obj(&(shp->shm_perm));
 
 		if (!capable(CAP_IPC_LOCK)) {
 			uid_t euid = current_euid();
@@ -997,6 +990,7 @@ asmlinkage long sys_shmdt(char __user *shmaddr)
 	 */
 	vma = find_vma(mm, addr);
 
+#ifdef CONFIG_MMU
 	while (vma) {
 		next = vma->vm_next;
 
@@ -1041,6 +1035,17 @@ asmlinkage long sys_shmdt(char __user *shmaddr)
 		vma = next;
 	}
 
+#else /* CONFIG_MMU */
+	/* under NOMMU conditions, the exact address to be destroyed must be
+	 * given */
+	retval = -EINVAL;
+	if (vma->vm_start == addr && vma->vm_ops == &shm_vm_ops) {
+		do_munmap(mm, vma->vm_start, vma->vm_end - vma->vm_start);
+		retval = 0;
+	}
+
+#endif
+
 	up_write(&mm->mmap_sem);
 	return retval;
 }