netdev - [PATCH v2 1/1] VF Resource State Inconsistency Vulnerability in Linux bnxt

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Message-ID: <20250827135102.5923-1-qianjiaru77@gmail.com>
Date: Wed, 27 Aug 2025 21:51:02 +0800
From: qianjiaru77@...il.com
To: michael.chan@...adcom.com,
	pavan.chebbi@...adcom.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	andrew+netdev@...n.ch
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	qianjiaru <qianjiaru77@...il.com>
Subject: [PATCH v2 1/1] VF Resource State Inconsistency Vulnerability in Linux bnxt_en Driver

From: qianjiaru <qianjiaru77@...il.com>

A state management vulnerability exists in the 
`bnxt_hwrm_reserve_vf_rings()` function of the Linux kernel's
bnxt_en network driver. The vulnerability causes incomplete 
resource state updates in SR-IOV Virtual Function (VF) environments,
potentially leading to system instability and resource allocation
 failures in virtualized deployments.


Signed-off-by: qianjiaru <qianjiaru77@...il.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 207a8bb36..2d06b0ddc 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -7801,7 +7801,13 @@ bnxt_hwrm_reserve_vf_rings(struct bnxt *bp, struct bnxt_hw_rings *hwr)
 	int rc;
 
 	if (!BNXT_NEW_RM(bp)) {
+		// Update all relevant resource state, not just TX rings
 		bp->hw_resc.resv_tx_rings = hwr->tx;
+		bp->hw_resc.resv_rx_rings = hwr->rx;
+		bp->hw_resc.resv_vnics = hwr->vnic;
+		bp->hw_resc.resv_rsscos_ctxs = hwr->rss_ctx;
+		bp->hw_resc.resv_cp_rings = hwr->cp;
+		bp->hw_resc.resv_hw_ring_grps = hwr->grp;
 		return 0;
 	}
 
-- 
2.34.1