linux-kernel - [net-next] net:enetc: bug fix for qos sfi operate space after freed

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Date:   Thu,  7 May 2020 18:57:38 +0800
From:   Po Liu <Po.Liu@....com>
To:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        netdev@...r.kernel.org, dan.carpenter@...cle.com
Cc:     davem@...emloft.net, claudiu.manoil@....com,
        Po Liu <Po.Liu@....com>
Subject: [net-next] net:enetc: bug fix for qos sfi operate space after freed

'Dan Carpenter' reported:
This code frees "sfi" and then dereferences it on the next line:
>                 kfree(sfi);
>                 clear_bit(sfi->index, epsfp.psfp_sfi_bitmap);

This "sfi->index" should be "index".

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Po Liu <Po.Liu@....com>
---
 drivers/net/ethernet/freescale/enetc/enetc_qos.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
index 48e589e9d0f7..77f110e24505 100644
--- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c
+++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c
@@ -903,7 +903,7 @@ static void stream_filter_unref(struct enetc_ndev_priv *priv, u32 index)
 		enetc_streamfilter_hw_set(priv, sfi, false);
 		hlist_del(&sfi->node);
 		kfree(sfi);
-		clear_bit(sfi->index, epsfp.psfp_sfi_bitmap);
+		clear_bit(index, epsfp.psfp_sfi_bitmap);
 	}
 }
 
-- 
2.17.1