linux-kernel - [PATCH] mmap: EINVAL not ENOMEM when rejecting VM

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Date:	Tue, 6 Mar 2012 12:28:52 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Al Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH] mmap: EINVAL not ENOMEM when rejecting VM_GROWS

Currently error is -ENOMEM when rejecting VM_GROWSDOWN|VM_GROWSUP
from shared anonymous: hoist the file case's -EINVAL up for both.

Signed-off-by: Hugh Dickins <hughd@...gle.com>
---

 mm/mmap.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- 3.3.0-rc6+/mm/mmap.c	2012-03-05 16:38:23.741975593 -0800
+++ linux/mm/mmap.c	2012-03-06 12:14:32.704674576 -0800
@@ -1266,8 +1266,9 @@ munmap_back:
 	vma->vm_pgoff = pgoff;
 	INIT_LIST_HEAD(&vma->anon_vma_chain);
 
+	error = -EINVAL;	/* when rejecting VM_GROWSDOWN|VM_GROWSUP */
+
 	if (file) {
-		error = -EINVAL;
 		if (vm_flags & (VM_GROWSDOWN|VM_GROWSUP))
 			goto free_vma;
 		if (vm_flags & VM_DENYWRITE) {
--
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