From 3d3653f9732c73feb8c4addfc1cbdaa292a399fa Mon Sep 17 00:00:00 2001
From: Kees Cook <keescook@chromium.org>
Date: Wed, 12 Jul 2017 14:35:22 -0700
Subject: ipc: move atomic_set() to where it is needed

Only after ipc_addid() has succeeded will refcounting be used, so move
initialization into ipc_addid() and remove from open-coded *_alloc()
routines.

Link: http://lkml.kernel.org/r/20170525185107.12869-17-manfred@colorfullife.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Manfred Spraul <manfred@colorfullife.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 ipc/shm.c | 2 --
 1 file changed, 2 deletions(-)

(limited to 'ipc/shm.c')

diff --git a/ipc/shm.c b/ipc/shm.c
index c5976d3..d1988ef 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -526,8 +526,6 @@ static struct shmid_kernel *shm_alloc(void)
 	if (unlikely(!shp))
 		return NULL;
 
-	atomic_set(&shp->shm_perm.refcount, 1);
-
 	return shp;
 }
 
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