linux-kernel - [PATCH] qed/qed_sriov: avoid a possible NULL deref in configure_min_tx

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Message-Id: <20230315194809.579756-1-d-tatianin@yandex-team.ru>
Date:   Wed, 15 Mar 2023 22:48:09 +0300
From:   Daniil Tatianin <d-tatianin@...dex-team.ru>
To:     Ariel Elior <aelior@...vell.com>
Cc:     Daniil Tatianin <d-tatianin@...dex-team.ru>,
        Manish Chopra <manishc@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Yuval Mintz <Yuval.Mintz@...gic.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] qed/qed_sriov: avoid a possible NULL deref in configure_min_tx_rate

We have to make sure that the info returned by qed_iov_get_vf_info is
valid before using it.

Found by Linux Verification Center (linuxtesting.org) with the SVACE
static analysis tool.

Fixes: 733def6a04bf ("qed*: IOV link control")
Signed-off-by: Daniil Tatianin <d-tatianin@...dex-team.ru>
---
 drivers/net/ethernet/qlogic/qed/qed_sriov.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_sriov.c b/drivers/net/ethernet/qlogic/qed/qed_sriov.c
index 2bf18748581d..cd43f1b23eb1 100644
--- a/drivers/net/ethernet/qlogic/qed/qed_sriov.c
+++ b/drivers/net/ethernet/qlogic/qed/qed_sriov.c
@@ -4404,6 +4404,9 @@ qed_iov_configure_min_tx_rate(struct qed_dev *cdev, int vfid, u32 rate)
 	}
 
 	vf = qed_iov_get_vf_info(QED_LEADING_HWFN(cdev), (u16)vfid, true);
+	if (!vf)
+		return -EINVAL;
+
 	vport_id = vf->vport_id;
 
 	return qed_configure_vport_wfq(cdev, vport_id, rate);
-- 
2.25.1