From: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
To: 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,
pabeni@redhat.com, ernis@linux.microsoft.com,
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
Subject: [PATCH net-next] net: mana: hardening: Reject zero max_num_queues from MANA_QUERY_VPORT_CONFIG
Date: Thu, 26 Mar 2026 10:48:10 -0700 [thread overview]
Message-ID: <20260326174815.2012137-1-ernis@linux.microsoft.com> (raw)
As a part of MANA hardening for CVM, validate that max_num_sq and
max_num_rq returned by MANA_QUERY_VPORT_CONFIG are not zero. These
values flow into apc->num_queues, which is used as an allocation count
and loop bound. A zero value would result in zero-size allocations and
incorrect driver behavior.
Return -EPROTO if either value is zero.
Signed-off-by: Erni Sri Satya Vennela <ernis@linux.microsoft.com>
---
drivers/net/ethernet/microsoft/mana/mana_en.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c
index b39e8b920791..a4197b4b0597 100644
--- a/drivers/net/ethernet/microsoft/mana/mana_en.c
+++ b/drivers/net/ethernet/microsoft/mana/mana_en.c
@@ -1249,6 +1249,12 @@ static int mana_query_vport_cfg(struct mana_port_context *apc, u32 vport_index,
*max_sq = resp.max_num_sq;
*max_rq = resp.max_num_rq;
+
+ if (*max_sq == 0 || *max_rq == 0) {
+ netdev_err(apc->ndev, "Invalid max queues from vPort config\n");
+ return -EPROTO;
+ }
+
if (resp.num_indirection_ent > 0 &&
resp.num_indirection_ent <= MANA_INDIRECT_TABLE_MAX_SIZE &&
is_power_of_2(resp.num_indirection_ent)) {
--
2.34.1
reply other threads:[~2026-03-26 17:48 UTC|newest]
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