linux-kernel - [PATCH] RDMA/hfi: add a judgment on the availability of cpumask

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Message-Id: <20230404030525.24020-1-xiaolinkui@126.com>
Date:   Tue,  4 Apr 2023 11:05:25 +0800
From:   xiaolinkui <xiaolinkui@....com>
To:     dennis.dalessandro@...nelisnetworks.com, jgg@...pe.ca,
        leon@...nel.org
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        Linkui Xiao <xiaolinkui@...inos.cn>
Subject: [PATCH] RDMA/hfi: add a judgment on the availability of cpumask

From: Linkui Xiao <xiaolinkui@...inos.cn>

When CONFIG_CPUMASK_OFFSTACK is n, cpumask may fail to allocate, cpumask may
be NULL, and performing a bitmap operation on cpumask may cause problems at
this time.

Of course, this is a unlikely event.

Signed-off-by: Linkui Xiao <xiaolinkui@...inos.cn>
---
 drivers/infiniband/hw/hfi1/affinity.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/affinity.c b/drivers/infiniband/hw/hfi1/affinity.c
index 77ee77d4000f..3caa861f4d1d 100644
--- a/drivers/infiniband/hw/hfi1/affinity.c
+++ b/drivers/infiniband/hw/hfi1/affinity.c
@@ -1047,16 +1047,16 @@ int hfi1_get_proc_affinity(int node)
 	 */
 
 	ret = zalloc_cpumask_var(&diff, GFP_KERNEL);
-	if (!ret)
+	if (!ret || unlikely(!diff))
 		goto done;
 	ret = zalloc_cpumask_var(&hw_thread_mask, GFP_KERNEL);
-	if (!ret)
+	if (!ret || unlikely(!hw_thread_mask))
 		goto free_diff;
 	ret = zalloc_cpumask_var(&available_mask, GFP_KERNEL);
-	if (!ret)
+	if (!ret || unlikely(!available_mask))
 		goto free_hw_thread_mask;
 	ret = zalloc_cpumask_var(&intrs_mask, GFP_KERNEL);
-	if (!ret)
+	if (!ret || unlikely(!intrs_mask))
 		goto free_available_mask;
 
 	mutex_lock(&affinity->lock);
-- 
2.17.1