From: Kees Cook <keescook@xxxxxxxxxxxx> Subject: 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@xxxxxxxxxxxxxxxx Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> Signed-off-by: Manfred Spraul <manfred@xxxxxxxxxxxxxxxx> Cc: Davidlohr Bueso <dave@xxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- ipc/sem.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff -puN ipc/sem.c~ipc-sem-do-not-use-ipc_rcu_free ipc/sem.c --- a/ipc/sem.c~ipc-sem-do-not-use-ipc_rcu_free +++ a/ipc/sem.c @@ -258,13 +258,18 @@ static void merge_queues(struct sem_arra } } +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 * 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; } _ -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
