linux-kernel - [PATCH 2/3] VM_GROWS{UP,DOWN} shouldn't be set on shmem VMAs

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Message-ID: <20120305063947.GJ23916@ZenIV.linux.org.uk>
Date:	Mon, 5 Mar 2012 06:39:47 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] VM_GROWS{UP,DOWN} shouldn't be set on shmem VMAs


Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
 mm/mmap.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 3f758c7..22e1a0b 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;
-- 
1.7.2.5


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