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ipc/sem: do not use ipc_rcu_free()

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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/[email protected]
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: Manfred Spraul <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Kees Cook 2017-07-12 14:34:50 -07:00 • committed by Linus Torvalds
commit 1b4654ef72
1 changed files with 7 additions and 2 deletions
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9
ipc/sem.c
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@ -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;
}