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-rw-r--r--ipc/shm.c3
1 files changed, 3 insertions, 0 deletions
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);
/*