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Tue, 31 Mar 2026 02:28:32 -0700 (PDT) Received: from [192.168.88.32] ([212.105.155.58]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4887c77df84sm17291665e9.4.2026.03.31.02.28.31 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 31 Mar 2026 02:28:32 -0700 (PDT) Message-ID: <4ceecee2-ea5a-4026-ad38-66c0a7d263cd@redhat.com> Date: Tue, 31 Mar 2026 11:28:30 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net-next] net: mana: hardening: Validate adapter_mtu from MANA_QUERY_DEV_CONFIG To: Erni Sri Satya Vennela , kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, ssengar@linux.microsoft.com, dipayanroy@linux.microsoft.com, gargaditya@linux.microsoft.com, shirazsaleem@microsoft.com, kees@kernel.org, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260326173101.2010514-1-ernis@linux.microsoft.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20260326173101.2010514-1-ernis@linux.microsoft.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/26/26 6:30 PM, Erni Sri Satya Vennela wrote: > As a part of MANA hardening for CVM, validate the adapter_mtu value > returned from the MANA_QUERY_DEV_CONFIG HWC command. > > The adapter_mtu value is used to compute ndev->max_mtu via: > gc->adapter_mtu - ETH_HLEN. If hardware returns a bogus adapter_mtu > smaller than ETH_HLEN (e.g. 0), the unsigned subtraction wraps to a > huge value, silently allowing oversized MTU settings. > > Add a validation check to reject adapter_mtu values below > ETH_MIN_MTU + ETH_HLEN, returning -EPROTO to fail the device > configuration early with a clear error message. > > Signed-off-by: Erni Sri Satya Vennela > --- > drivers/net/ethernet/microsoft/mana/mana_en.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c > index b39e8b920791..bd07d17a6017 100644 > --- a/drivers/net/ethernet/microsoft/mana/mana_en.c > +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c > @@ -1207,10 +1207,16 @@ static int mana_query_device_cfg(struct mana_context *ac, u32 proto_major_ver, > > *max_num_vports = resp.max_num_vports; > > - if (resp.hdr.response.msg_version >= GDMA_MESSAGE_V2) > + if (resp.hdr.response.msg_version >= GDMA_MESSAGE_V2) { > + if (resp.adapter_mtu < ETH_MIN_MTU + ETH_HLEN) { > + dev_err(dev, "Adapter MTU too small: %u\n", > + resp.adapter_mtu); > + return -EPROTO; AI review says: If this returns -EPROTO, does the caller mana_probe() jump to an error label and call mana_remove()? If so, mana_remove() unconditionally calls disable_work_sync(&ac->link_change_work) and cancel_delayed_work_sync(&ac->gf_stats_work). Since mana_query_device_cfg() is called before INIT_WORK() and INIT_DELAYED_WORK() in the probe sequence, wouldn't this result in calling sync cancellation functions on uninitialized, zeroed work structures? This can lead to a WARN_ON(!work->func) in __flush_work(), or debug object warnings if CONFIG_DEBUG_OBJECTS_WORK is enabled. While this initialization issue appears to already exist for other early error paths, this new error path can also trigger it.