linux-kernel - [PATCH 25/69] qlcnic: Add null check after calling netdev_alloc

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Message-Id: <20210503115736.2104747-26-gregkh@linuxfoundation.org>
Date:   Mon,  3 May 2021 13:56:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Tom Seewald <tseewald@...il.com>,
        "David S . Miller" <davem@...emloft.net>,
        stable <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 25/69] qlcnic: Add null check after calling netdev_alloc_skb

From: Tom Seewald <tseewald@...il.com>

The function qlcnic_dl_lb_test() currently calls netdev_alloc_skb()
without checking afterwards that the allocation succeeded. Fix this by
checking if the skb is NULL and returning an error in such a case.
Breaking out of the loop if the skb is NULL is not correct as no error
would be reported to the caller and no message would be printed for the
user.

Cc: David S. Miller <davem@...emloft.net>
Cc: stable <stable@...r.kernel.org>
Signed-off-by: Tom Seewald <tseewald@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
index 985cf8cb2ec0..d8f0863b3934 100644
--- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
+++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_ethtool.c
@@ -1047,6 +1047,8 @@ int qlcnic_do_lb_test(struct qlcnic_adapter *adapter, u8 mode)
 
 	for (i = 0; i < QLCNIC_NUM_ILB_PKT; i++) {
 		skb = netdev_alloc_skb(adapter->netdev, QLCNIC_ILB_PKT_SIZE);
+		if (!skb)
+			goto error;
 		qlcnic_create_loopback_buff(skb->data, adapter->mac_addr);
 		skb_put(skb, QLCNIC_ILB_PKT_SIZE);
 		adapter->ahw->diag_cnt = 0;
@@ -1070,6 +1072,7 @@ int qlcnic_do_lb_test(struct qlcnic_adapter *adapter, u8 mode)
 			cnt++;
 	}
 	if (cnt != i) {
+error:
 		dev_err(&adapter->pdev->dev,
 			"LB Test: failed, TX[%d], RX[%d]\n", i, cnt);
 		if (mode != QLCNIC_ILB_MODE)
-- 
2.31.1