linux-kernel - [PATCH] fix a potential memory leak in stmmac_xdp_enable

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Message-Id: <20260125135412.2070798-1-lihaoxiang@isrc.iscas.ac.cn>
Date: Sun, 25 Jan 2026 21:54:12 +0800
From: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
To: ast@...nel.org,
	daniel@...earbox.net,
	davem@...emloft.net,
	kuba@...nel.org,
	hawk@...nel.org,
	john.fastabend@...il.com,
	sdf@...ichev.me,
	andrew+netdev@...n.ch,
	edumazet@...gle.com,
	pabeni@...hat.com,
	mcoquelin.stm32@...il.com,
	alexandre.torgue@...s.st.com,
	boon.leong.ong@...el.com
Cc: netdev@...r.kernel.org,
	bpf@...r.kernel.org,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>,
	stable@...r.kernel.org
Subject: [PATCH] fix a potential memory leak in stmmac_xdp_enable_pool()

In stmmac_xdp_enable_pool(), if stmmac_xsk_wakeup() fails,
the memory allocated by xsk_pool_dma_map() should be released.
Add xsk_pool_dma_unmap() to do so.

Fixes: bba2556efad6 ("net: stmmac: Enable RX via AF_XDP zero-copy")
Cc: stable@...r.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang@...c.iscas.ac.cn>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
index d7e4db7224b0..7d89d6066ea3 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_xdp.c
@@ -48,8 +48,10 @@ static int stmmac_xdp_enable_pool(struct stmmac_priv *priv,
 		napi_enable(&ch->rxtx_napi);
 
 		err = stmmac_xsk_wakeup(priv->dev, queue, XDP_WAKEUP_RX);
-		if (err)
+		if (err) {
+			xsk_pool_dma_unmap(pool, STMMAC_RX_DMA_ATTR);
 			return err;
+		}
 	}
 
 	return 0;
-- 
2.25.1