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Message-Id: <20220407102900.3086255-11-jakobkoschel@gmail.com>
Date: Thu, 7 Apr 2022 12:28:55 +0200
From: Jakob Koschel <jakobkoschel@...il.com>
To: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
Andrew Lunn <andrew@...n.ch>,
Vivien Didelot <vivien.didelot@...il.com>,
Florian Fainelli <f.fainelli@...il.com>,
Vladimir Oltean <olteanv@...il.com>,
Lars Povlsen <lars.povlsen@...rochip.com>,
Steen Hegelund <Steen.Hegelund@...rochip.com>,
UNGLinuxDriver@...rochip.com, Ariel Elior <aelior@...vell.com>,
Manish Chopra <manishc@...vell.com>,
Edward Cree <ecree.xilinx@...il.com>,
Martin Habets <habetsm.xilinx@...il.com>,
Michael Ellerman <mpe@...erman.id.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Paul Mackerras <paulus@...ba.org>,
Jiri Pirko <jiri@...nulli.us>,
Casper Andersson <casper.casan@...il.com>,
Bjarni Jonasson <bjarni.jonasson@...rochip.com>,
Jakob Koschel <jakobkoschel@...il.com>,
Colin Ian King <colin.king@...el.com>,
Michael Walle <michael@...le.cc>,
Christophe JAILLET <christophe.jaillet@...adoo.fr>,
Arnd Bergmann <arnd@...db.de>,
Eric Dumazet <edumazet@...gle.com>,
Di Zhu <zhudi21@...wei.com>, Xu Wang <vulab@...as.ac.cn>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linuxppc-dev@...ts.ozlabs.org, Mike Rapoport <rppt@...nel.org>,
"Brian Johannesmeyer" <bjohannesmeyer@...il.com>,
Cristiano Giuffrida <c.giuffrida@...nl>,
"Bos, H.J." <h.j.bos@...nl>
Subject: [PATCH net-next 10/15] net: qede: Remove check of list iterator against head past the loop body
When list_for_each_entry() completes the iteration over the whole list
without breaking the loop, the iterator value will be a bogus pointer
computed based on the head element.
While it is safe to use the pointer to determine if it was computed
based on the head element, either with list_entry_is_head() or
&pos->member == head, using the iterator variable after the loop should
be avoided.
In preparation to limit the scope of a list iterator to the list
traversal loop, use a dedicated pointer to point to the found element [1].
Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/ [1]
Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
---
drivers/net/ethernet/qlogic/qede/qede_filter.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/qlogic/qede/qede_filter.c b/drivers/net/ethernet/qlogic/qede/qede_filter.c
index 3010833ddde3..3d167e37e654 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_filter.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_filter.c
@@ -829,18 +829,21 @@ int qede_configure_vlan_filters(struct qede_dev *edev)
int qede_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid)
{
struct qede_dev *edev = netdev_priv(dev);
- struct qede_vlan *vlan;
+ struct qede_vlan *vlan = NULL;
+ struct qede_vlan *iter;
int rc = 0;
DP_VERBOSE(edev, NETIF_MSG_IFDOWN, "Removing vlan 0x%04x\n", vid);
/* Find whether entry exists */
__qede_lock(edev);
- list_for_each_entry(vlan, &edev->vlan_list, list)
- if (vlan->vid == vid)
+ list_for_each_entry(iter, &edev->vlan_list, list)
+ if (iter->vid == vid) {
+ vlan = iter;
break;
+ }
- if (list_entry_is_head(vlan, &edev->vlan_list, list)) {
+ if (!vlan) {
DP_VERBOSE(edev, (NETIF_MSG_IFUP | NETIF_MSG_IFDOWN),
"Vlan isn't configured\n");
goto out;
--
2.25.1
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