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Date: Mon, 10 Oct 2022 10:38:58 +0800 From: Kemeng Shi <shikemeng@...wei.com> To: <tj@...nel.org>, <axboe@...nel.dk> CC: <cgroups@...r.kernel.org>, <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <shikemeng@...wei.com> Subject: [PATCH 3/4] blk-cgroup: Add NULL check of pd_alloc_fn in blkcg_activate_policy Function blkcg_policy_register only make sure pd_alloc_fn and pd_free_fn in pairs, so pd_alloc_fn could be NULL in registered blkcg_policy. Check NULL before use for pd_alloc_fn in blkcg_activate_policy to avoid protential NULL dereference. Signed-off-by: Kemeng Shi <shikemeng@...wei.com> --- block/blk-cgroup.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index 463c568d3e86..fc083c35dc42 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -1404,6 +1404,9 @@ int blkcg_activate_policy(struct request_queue *q, if (blkcg_policy_enabled(q, pol)) return 0; + if (pol->pd_alloc_fn == NULL) + return -EINVAL; + if (queue_is_mq(q)) blk_mq_freeze_queue(q); retry: -- 2.30.0
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