[PATCH v2] qed/qed_sriov: guard against NULL derefs from qed_iov_get_vf_info

[Daniil Tatianin]

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

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

Fixes: f990c82c385b ("qed*: Add support for ndo_set_vf_trust")
Fixes: 733def6a04bf ("qed*: IOV link control")
Signed-off-by: Daniil Tatianin <d-tatianin@xxxxxxxxxxxxxx>
---
Changes since v1:
- Add a vf check to qed_iov_handle_trust_change as well
---
 drivers/net/ethernet/qlogic/qed/qed_sriov.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/qlogic/qed/qed_sriov.c b/drivers/net/ethernet/qlogic/qed/qed_sriov.c
index 2bf18748581d..fa167b1aa019 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);
@@ -5152,7 +5155,7 @@ static void qed_iov_handle_trust_change(struct qed_hwfn *hwfn)
 
 		/* Validate that the VF has a configured vport */
 		vf = qed_iov_get_vf_info(hwfn, i, true);
-		if (!vf->vport_instance)
+		if (!vf || !vf->vport_instance)
 			continue;
 
 		memset(&params, 0, sizeof(params));
-- 
2.25.1