linux-kernel - [PATCH 5.17 120/225] net: lan966x: fix a couple off by one bugs

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Date:   Wed,  4 May 2022 18:45:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.17 120/225] net: lan966x: fix a couple off by one bugs

From: Dan Carpenter <dan.carpenter@...cle.com>

[ Upstream commit 9810c58c7051ae83e7ac326fca3daa823da6b778 ]

The lan966x->ports[] array has lan966x->num_phys_ports elements.  These
are assigned in lan966x_probe().  That means the > comparison should be
changed to >=.

The first off by one check is harmless but the second one could lead to
an out of bounds access and a crash.

Fixes: 5ccd66e01cbe ("net: lan966x: add support for interrupts from analyzer")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/ethernet/microchip/lan966x/lan966x_mac.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
index 2679111ef669..005e56ea5da1 100644
--- a/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
+++ b/drivers/net/ethernet/microchip/lan966x/lan966x_mac.c
@@ -346,7 +346,7 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 
 			lan966x_mac_process_raw_entry(&raw_entries[column],
 						      mac, &vid, &dest_idx);
-			if (WARN_ON(dest_idx > lan966x->num_phys_ports))
+			if (WARN_ON(dest_idx >= lan966x->num_phys_ports))
 				continue;
 
 			/* If the entry in SW is found, then there is nothing
@@ -393,7 +393,7 @@ static void lan966x_mac_irq_process(struct lan966x *lan966x, u32 row,
 
 		lan966x_mac_process_raw_entry(&raw_entries[column],
 					      mac, &vid, &dest_idx);
-		if (WARN_ON(dest_idx > lan966x->num_phys_ports))
+		if (WARN_ON(dest_idx >= lan966x->num_phys_ports))
 			continue;
 
 		mac_entry = lan966x_mac_alloc_entry(mac, vid, dest_idx);
-- 
2.35.1