diff options
| -rw-r--r-- | mm/nommu.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index 8bdde9508f3..6a2a8aada40 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -497,15 +497,17 @@ static int validate_mmap_request(struct file *file, (flags & MAP_TYPE) != MAP_SHARED) return -EINVAL; - if (PAGE_ALIGN(len) == 0) - return addr; - - if (len > TASK_SIZE) + if (!len) return -EINVAL; + /* Careful about overflows.. */ + len = PAGE_ALIGN(len); + if (!len || len > TASK_SIZE) + return -ENOMEM; + /* offset overflow? */ if ((pgoff + (len >> PAGE_SHIFT)) < pgoff) - return -EINVAL; + return -EOVERFLOW; if (file) { /* validate file mapping requests */ |