diff options
| author | Manfred Spraul <[email protected]> | 2018-08-21 22:01:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2018-08-22 10:52:52 -0700 |
| commit | 2e5ceb452c9b7f0a30c87bd61c01260e3d8464ad (patch) | |
| tree | b4a999c84f6a8935a46a35d741ef07968a9a330c | |
| parent | 4241c1a304078569f544d51eeaf8bc270b6e377a (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: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Manfred Spraul <[email protected]>
Reviewed-by: Davidlohr Bueso <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Michael Kerrisk <[email protected]>
Cc: Michal Hocko <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | ipc/util.c | 4 |
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. |