linux-kernel - [PATCH] iavf: Fix null pointer dereference in iavf_print_link

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Message-Id: <20231211025927.233449-1-chentao@kylinos.cn>
Date:   Mon, 11 Dec 2023 10:59:27 +0800
From:   Kunwu Chan <chentao@...inos.cn>
To:     jesse.brandeburg@...el.com, anthony.l.nguyen@...el.com,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     jacob.e.keller@...el.com, przemyslaw.kitszel@...el.com,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Kunwu Chan <chentao@...inos.cn>,
        Kunwu Chan <kunwu.chan@...mail.com>
Subject: [PATCH] iavf: Fix null pointer dereference in iavf_print_link_message

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Fixes: 1978d3ead82c ("intel: fix string truncation warnings")
Cc: Kunwu Chan <kunwu.chan@...mail.com>
Signed-off-by: Kunwu Chan <chentao@...inos.cn>
---
 drivers/net/ethernet/intel/iavf/iavf_virtchnl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
index 64c4443dbef9..1b50d351f28b 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_virtchnl.c
@@ -1444,6 +1444,8 @@ static void iavf_print_link_message(struct iavf_adapter *adapter)
 		speed = kasprintf(GFP_KERNEL, "%d Mbps", link_speed_mbps);
 	}
 
+	if (!speed)
+		return;
 	netdev_info(netdev, "NIC Link is Up Speed is %s Full Duplex\n", speed);
 	kfree(speed);
 }
-- 
2.39.2