netdev - [PATCH AUTOSEL 5.7 028/274] net: atlantic: make hw_get

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Date:   Mon,  8 Jun 2020 19:02:01 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mark Starovoytov <mstarovoitov@...vell.com>,
        "David S . Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.7 028/274] net: atlantic: make hw_get_regs optional

From: Mark Starovoytov <mstarovoitov@...vell.com>

[ Upstream commit d0f23741c202c685447050713907f3be39a985ee ]

This patch fixes potential crash in case if hw_get_regs is NULL.

Signed-off-by: Mark Starovoytov <mstarovoitov@...vell.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/aquantia/atlantic/aq_nic.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
index a369705a786a..e5391e0b84f8 100644
--- a/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_nic.c
@@ -764,6 +764,9 @@ int aq_nic_get_regs(struct aq_nic_s *self, struct ethtool_regs *regs, void *p)
 	u32 *regs_buff = p;
 	int err = 0;
 
+	if (unlikely(!self->aq_hw_ops->hw_get_regs))
+		return -EOPNOTSUPP;
+
 	regs->version = 1;
 
 	err = self->aq_hw_ops->hw_get_regs(self->aq_hw,
@@ -778,6 +781,9 @@ int aq_nic_get_regs(struct aq_nic_s *self, struct ethtool_regs *regs, void *p)
 
 int aq_nic_get_regs_count(struct aq_nic_s *self)
 {
+	if (unlikely(!self->aq_hw_ops->hw_get_regs))
+		return 0;
+
 	return self->aq_nic_cfg.aq_hw_caps->mac_regs_count;
 }
 
-- 
2.25.1