VM_GROWS{UP,DOWN} shouldn't be set on shmem VMAs

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
gby · Mar 5, 2012 · 835ee79 · 835ee79
1 parent 6414fa6
commit 835ee79
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/mm/mmap.c b/mm/mmap.c
@@ -1293,6 +1293,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr,
 		pgoff = vma->vm_pgoff;
 		vm_flags = vma->vm_flags;
 	} else if (vm_flags & VM_SHARED) {
+		if (unlikely(vm_flags & (VM_GROWSDOWN|VM_GROWSUP)))
+			goto free_vma;
 		error = shmem_zero_setup(vma);
 		if (error)
 			goto free_vma;