Message ID | 20220415122947.2754662-14-jakobkoschel@gmail.com (mailing list archive) |
---|---|
State | Handled Elsewhere, archived |
Headers | show
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[62.195.130.160]) by smtp.googlemail.com with ESMTPSA id bo14-20020a170906d04e00b006ce98d9c3e3sm1649533ejb.194.2022.04.15.05.31.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Apr 2022 05:31:03 -0700 (PDT) From: Jakob Koschel <jakobkoschel@gmail.com> To: "David S. Miller" <davem@davemloft.net> Subject: [PATCH net-next v4 13/18] net: qede: Remove check of list iterator against head past the loop body Date: Fri, 15 Apr 2022 14:29:42 +0200 Message-Id: <20220415122947.2754662-14-jakobkoschel@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220415122947.2754662-1-jakobkoschel@gmail.com> References: <20220415122947.2754662-1-jakobkoschel@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List <linuxppc-dev.lists.ozlabs.org> List-Unsubscribe: <https://lists.ozlabs.org/options/linuxppc-dev>, <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=unsubscribe> List-Archive: <http://lists.ozlabs.org/pipermail/linuxppc-dev/> List-Post: <mailto:linuxppc-dev@lists.ozlabs.org> List-Help: <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=help> List-Subscribe: <https://lists.ozlabs.org/listinfo/linuxppc-dev>, <mailto:linuxppc-dev-request@lists.ozlabs.org?subject=subscribe> Cc: Andrew Lunn <andrew@lunn.ch>, Song Liu <songliubraving@fb.com>, Alexei Starovoitov <ast@kernel.org>, Eric Dumazet <edumazet@google.com>, Paul Mackerras <paulus@samba.org>, Ariel Elior <aelior@marvell.com>, Florian Fainelli <f.fainelli@gmail.com>, Daniel Borkmann <daniel@iogearbox.net>, Steen Hegelund <Steen.Hegelund@microchip.com>, John Fastabend <john.fastabend@gmail.com>, Andrii Nakryiko <andrii@kernel.org>, "Bos, H.J." <h.j.bos@vu.nl>, linux-arm-kernel@lists.infradead.org, Martin Habets <habetsm.xilinx@gmail.com>, Paolo Abeni <pabeni@redhat.com>, Vivien Didelot <vivien.didelot@gmail.com>, Bjarni Jonasson <bjarni.jonasson@microchip.com>, Jiri Pirko <jiri@resnulli.us>, Arnd Bergmann <arnd@arndb.de>, KP Singh <kpsingh@kernel.org>, Christophe JAILLET <christophe.jaillet@wanadoo.fr>, Jakob Koschel <jakobkoschel@gmail.com>, Jakub Kicinski <kuba@kernel.org>, Brian Johannesmeyer <bjohannesmeyer@gmail.com>, Lars Povlsen <lars.povlsen@microchip.com>, Colin Ian King <colin.king@intel.com>, Manish Chopra <manishc@marvell.com>, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, UNGLinuxDriver@microchip.com, Yonghong Song <yhs@fb.com>, Edward Cree <ecree.xilinx@gmail.com>, Casper Andersson <casper.casan@gmail.com>, Xu Wang <vulab@iscas.ac.cn>, Cristiano Giuffrida <c.giuffrida@vu.nl>, bpf@vger.kernel.org, Vladimir Oltean <olteanv@gmail.com>, linuxppc-dev@lists.ozlabs.org, Martin KaFai Lau <kafai@fb.com>, Mike Rapoport <rppt@kernel.org> Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" <linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org> |
Series |
Remove use of list iterator after loop body
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expand
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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;
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@gmail.com> --- drivers/net/ethernet/qlogic/qede/qede_filter.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)