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Wed, 05 Aug 2026 14:33:59 -0700 (PDT) From: Gustavo Luiz Duarte Date: Wed, 05 Aug 2026 22:33:04 +0100 Subject: [PATCH net-next 4/4] netconsole: reject a target mixing IPv4 and IPv6 addresses Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260805-netcons_ipv6-v1-4-170a35b92da1@gmail.com> References: <20260805-netcons_ipv6-v1-0-170a35b92da1@gmail.com> In-Reply-To: <20260805-netcons_ipv6-v1-0-170a35b92da1@gmail.com> To: Breno Leitao , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Simon Horman Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, Gustavo Luiz Duarte X-Mailer: b4 0.15.2 The local_ip and remote_ip configfs attributes are written independently and nothing stops a user from mixing ipv4 and ipv6. This leads to an ipv4 address being zero-extended into an ipv6 header or an ipv6 address being truncated to its first 4 bytes for an ipv4 header. The command-line parser already refuses such a mismatch. This adds a similar check when a dynamic target is being enabled. Signed-off-by: Gustavo Luiz Duarte --- drivers/net/netconsole.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c index a41b0a5ce64f..69621705d68d 100644 --- a/drivers/net/netconsole.c +++ b/drivers/net/netconsole.c @@ -477,6 +477,13 @@ static int netcons_netpoll_setup(struct netconsole_target *nt) goto unlock; } + if (nt->local_ip.family != AF_UNSPEC && + nt->local_ip.family != nt->remote_ip.family) { + np_err(np, "local and remote IP address families differ, aborting\n"); + err = -EINVAL; + goto unlock; + } + if (np->dev_name[0]) ndev = __dev_get_by_name(net, np->dev_name); else if (is_valid_ether_addr(np->dev_mac)) -- 2.55.0