From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Muhammad Sammar <muhammads@mellanox.com>,
Feras Daoud <ferasda@mellanox.com>,
Leon Romanovsky <leonro@mellanox.com>,
Jason Gunthorpe <jgg@mellanox.com>,
Sasha Levin <sashal@kernel.org>,
linux-rdma@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 043/103] IB/ipoib: Ensure that MTU isn't less than minimum permitted
Date: Fri, 8 Nov 2019 06:42:08 -0500 [thread overview]
Message-ID: <20191108114310.14363-43-sashal@kernel.org> (raw)
In-Reply-To: <20191108114310.14363-1-sashal@kernel.org>
From: Muhammad Sammar <muhammads@mellanox.com>
[ Upstream commit 142a9c287613560edf5a03c8d142c8b6ebc1995b ]
It is illegal to change MTU to a value lower than the minimum MTU
stated in ethernet spec. In addition to that we need to add 4 bytes
for encapsulation header (IPOIB_ENCAP_LEN).
Before "ifconfig ib0 mtu 0" command, succeeds while it obviously shouldn't.
Signed-off-by: Muhammad Sammar <muhammads@mellanox.com>
Reviewed-by: Feras Daoud <ferasda@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/infiniband/ulp/ipoib/ipoib_main.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index 1a93d3d58c8a4..caae4bfab950d 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -249,7 +249,8 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
- if (new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
+ if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
+ new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
return -EINVAL;
priv->admin_mtu = new_mtu;
--
2.20.1
next prev parent reply other threads:[~2019-11-08 11:59 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191108114310.14363-1-sashal@kernel.org>
2019-11-08 11:41 ` [PATCH AUTOSEL 4.14 027/103] IB/rxe: fixes for rdma read retry Sasha Levin
2019-11-08 11:42 ` Sasha Levin [this message]
2019-11-08 11:42 ` [PATCH AUTOSEL 4.14 044/103] RDMA/core: Rate limit MAD error messages Sasha Levin
2019-11-08 11:42 ` [PATCH AUTOSEL 4.14 045/103] RDMA/core: Follow correct unregister order between sysfs and cgroup Sasha Levin
2019-11-08 11:42 ` [PATCH AUTOSEL 4.14 063/103] IB/hfi1: Missing return value in error path for user sdma Sasha Levin
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