netdev - [Patch v6 3/4] bnx2x: Prevent access to a freed page in page

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Message-Id: <20230818161443.708785-4-thinhtr@linux.vnet.ibm.com>
Date: Fri, 18 Aug 2023 11:14:42 -0500
From: Thinh Tran <thinhtr@...ux.vnet.ibm.com>
To: kuba@...nel.org
Cc: aelior@...vell.com, davem@...emloft.net, edumazet@...gle.com,
        manishc@...vell.com, netdev@...r.kernel.org, pabeni@...hat.com,
        skalluru@...vell.com, VENKATA.SAI.DUGGI@....com,
        Thinh Tran <thinhtr@...ux.vnet.ibm.com>
Subject: [Patch v6 3/4] bnx2x: Prevent access to a freed page in page_pool

Verify page pool allocations before freeing. 
Fixes: Fixes: 523224a3b3cd ("bnx2x, cnic, bnx2i: use new FW/HSI")

Signed-off-by: Thinh Tran <thinhtr@...ux.vnet.ibm.com>
---
 drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
index 0ad879a5af95..ca3ab06206b3 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h
@@ -1016,6 +1016,9 @@ static inline void bnx2x_free_rx_sge_range(struct bnx2x *bp,
 {
 	int i;
 
+	if (!fp->page_pool.page)
+		return;
+
 	if (fp->mode == TPA_MODE_DISABLED)
 		return;
 
-- 
2.27.0