1 files changed, 3 insertions, 0 deletions

diff --git a/ipc/shm.c b/ipc/shm.c
index 9162123a7b23..16fe2786087d 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);
 
         /*