[PATCH] fix a potential memory leak in stmmac_xdp_enable_pool()

[Haoxiang Li]

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 at vger.kernel.org
Signed-off-by: Haoxiang Li <lihaoxiang at isrc.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