path: root/ipc/util.c
diff options
authorManfred Spraul <>2018-08-21 22:01:37 -0700
committerLinus Torvalds <>2018-08-22 10:52:52 -0700
commit2e5ceb452c9b7f0a30c87bd61c01260e3d8464ad (patch)
treeb4a999c84f6a8935a46a35d741ef07968a9a330c /ipc/util.c
parent4241c1a304078569f544d51eeaf8bc270b6e377a (diff)
ipc/util.c: correct comment in ipc_obtain_object_check
The comment that explains ipc_obtain_object_check is wrong: The function checks the sequence number, not the reference counter. Note that checking the reference counter would be meaningless: The reference counter is decreased without holding any locks, thus an object with kern_ipc_perm.deleted=true may disappear at the end of the next rcu grace period. Link: Signed-off-by: Manfred Spraul <> Reviewed-by: Davidlohr Bueso <> Cc: Davidlohr Bueso <> Cc: Dmitry Vyukov <> Cc: Herbert Xu <> Cc: Kees Cook <> Cc: Michael Kerrisk <> Cc: Michal Hocko <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'ipc/util.c')
1 files changed, 2 insertions, 2 deletions
diff --git a/ipc/util.c b/ipc/util.c
index 1d88dffd75e7..dcb437095cbd 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -629,8 +629,8 @@ err:
* @ids: ipc identifier set
* @id: ipc id to look for
- * Similar to ipc_obtain_object_idr() but also checks
- * the ipc object reference counter.
+ * Similar to ipc_obtain_object_idr() but also checks the ipc object
+ * sequence number.
* Call inside the RCU critical section.
* The ipc object is *not* locked on exit.