[patch 014/104] sysvipc: fix the ipc structures initialization

Greg KH
2008-12-03T19:55:58Z

[-- Attachment #1: sysvipc-fix-the-ipc-structures-initialization.patch --]
[-- Type: text/plain, Size: 1680 bytes --]

2.6.27-stable review patch. If anyone has any objections, please let us know.

------------------
From: Nadia Derbey <Nadia.Derbey@bull.net>

commit e00b4ff7ebf098b11b11be403921c1cf41d9e321 upstream.

A problem was found while reviewing the code after Bugzilla bug
http://bugzilla.kernel.org/show_bug.cgi?id=11796.

In ipc_addid(), the newly allocated ipc structure is inserted into the
ipcs tree (i.e made visible to readers) without locking it. This is not
correct since its initialization continues after it has been inserted in
the tree.

This patch moves the ipc structure lock initialization + locking before
the actual insertion.

Signed-off-by: Nadia Derbey <Nadia.Derbey@bull.net>
Reported-by: Clement Calmels <cboulte@gmail.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
ipc/util.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)

--- a/ipc/util.c
+++ b/ipc/util.c
@@ -266,9 +266,17 @@ int ipc_addid(struct ipc_ids* ids, struc
if (ids->in_use >= size)
return -ENOSPC;

+ spin_lock_init(&new->lock);
+ new->deleted = 0;
+ rcu_read_lock();
+ spin_lock(&new->lock);
+
err = idr_get_new(&ids->ipcs_idr, new, &id);
- if (err)
+ if (err) {
+ spin_unlock(&new->lock);
+ rcu_read_unlock();
return err;
+ }

ids->in_use++;

@@ -280,10 +288,6 @@ int ipc_addid(struct ipc_ids* ids, struc
ids->seq = 0;

new->id = ipc_buildid(id, new->seq);
- spin_lock_init(&new->lock);
- new->deleted = 0;
- rcu_read_lock();
- spin_lock(&new->lock);
return id;
}