From: Al Viro <viro@ZenIV.linux.org.uk>
Date: Mon, 5 Mar 2012 06:39:47 +0000 (+0000)
Subject: VM_GROWS{UP,DOWN} shouldn't be set on shmem VMAs
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=835ee7978cb47de94cf70232a694f19295d2993f;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

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>
---

diff --git a/mm/mmap.c b/mm/mmap.c
index 3f758c7f4c81..22e1a0b2f70c 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1293,6 +1293,8 @@ munmap_back:
 		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;