1 files changed, 9 insertions, 0 deletions

diff --git a/ipc/util.h b/ipc/util.h
index 1ee81bce25e9..d768fdbed515 100644
--- a/ipc/util.h
+++ b/ipc/util.h
@@ -217,6 +217,15 @@ int ipcget(struct ipc_namespace *ns, struct ipc_ids *ids,
 void free_ipcs(struct ipc_namespace *ns, struct ipc_ids *ids,
                 void (*free)(struct ipc_namespace *, struct kern_ipc_perm *));
 
+static inline int sem_check_semmni(struct ipc_namespace *ns) {
+        /*
+         * Check semmni range [0, IPCMNI]
+         * semmni is the last element of sem_ctls[4] array
+         */
+        return ((ns->sem_ctls[3] < 0) || (ns->sem_ctls[3] > IPCMNI))
+                ? -ERANGE : 0;
+}
+
 #ifdef CONFIG_COMPAT
 #include <linux/compat.h>
 struct compat_ipc_perm {