diff options
Diffstat (limited to 'ipc/shm.c')
| -rw-r--r-- | ipc/shm.c | 3 |
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); /* |