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authorKees Cook <keescook@chromium.org>2017-07-12 14:34:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-07-12 16:26:01 -0700
commit1b4654ef72f61c84704b3c79b50fdeed8747fc56 (patch)
tree2000d23e0b175f738608eff7605761534017f465 /ipc/sem.c
parentipc: drop non-RCU allocation (diff)
downloadlinux-dev-1b4654ef72f61c84704b3c79b50fdeed8747fc56.tar.xz
linux-dev-1b4654ef72f61c84704b3c79b50fdeed8747fc56.zip
ipc/sem: do not use ipc_rcu_free()
Avoid using ipc_rcu_free, since it just re-finds the original structure pointer. For the pre-list-init failure path, there is no RCU needed, since it was just allocated. It can be directly freed. Link: http://lkml.kernel.org/r/20170525185107.12869-6-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>
Diffstat (limited to 'ipc/sem.c')
-rw-r--r--ipc/sem.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/ipc/sem.c b/ipc/sem.c
index 484ccf83cf85..a04c4d6d120c 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -258,13 +258,18 @@ static void merge_queues(struct sem_array *sma)
}
}
+static void __sem_free(struct sem_array *sma)
+{
+ kvfree(sma);
+}
+
static void sem_rcu_free(struct rcu_head *head)
{
struct kern_ipc_perm *p = container_of(head, struct kern_ipc_perm, rcu);
struct sem_array *sma = container_of(p, struct sem_array, sem_perm);
security_sem_free(sma);
- ipc_rcu_free(head);
+ __sem_free(sma);
}
/*
@@ -482,7 +487,7 @@ static int newary(struct ipc_namespace *ns, struct ipc_params *params)
sma->sem_perm.security = NULL;
retval = security_sem_alloc(sma);
if (retval) {
- ipc_rcu_putref(&sma->sem_perm, ipc_rcu_free);
+ __sem_free(sma);
return retval;
}