linux-kernel - [PATCH] Drivers: hv : vmbus: Adding NULL pointer check

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Message-Id: <20211028104138.14576-1-lv.ruyi@zte.com.cn>
Date:   Thu, 28 Oct 2021 10:41:38 +0000
From:   cgel.zte@...il.com
To:     kys@...rosoft.com
Cc:     haiyangz@...rosoft.com, sthemmin@...rosoft.com, wei.liu@...nel.org,
        decui@...rosoft.com, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, Lv Ruyi <lv.ruyi@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH] Drivers: hv : vmbus: Adding NULL pointer check

From: Lv Ruyi <lv.ruyi@....com.cn>

This patch fixes the following Coccinelle warning:
drivers/hv/ring_buffer.c:223: alloc with no test

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: Lv Ruyi <lv.ruyi@....com.cn>
---
 drivers/hv/ring_buffer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/hv/ring_buffer.c b/drivers/hv/ring_buffer.c
index 931802ae985c..4ef5c3771079 100644
--- a/drivers/hv/ring_buffer.c
+++ b/drivers/hv/ring_buffer.c
@@ -223,6 +223,8 @@ int hv_ringbuffer_init(struct hv_ring_buffer_info *ring_info,
 		pages_wraparound = kcalloc(page_cnt * 2 - 1,
 					   sizeof(struct page *),
 					   GFP_KERNEL);
+		if (!pages_wraparound)
+			return -ENOMEM;
 
 		pages_wraparound[0] = pages;
 		for (i = 0; i < 2 * (page_cnt - 1); i++)
-- 
2.25.1