netdev - [PATCH net] net: broadcom: bcm4908_enet: fix RX path possible mem leak

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Message-Id: <20210224151842.2419-1-zajec5@gmail.com>
Date:   Wed, 24 Feb 2021 16:18:41 +0100
From:   Rafał Miłecki <zajec5@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, Florian Fainelli <f.fainelli@...il.com>,
        bcm-kernel-feedback-list@...adcom.com,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH net] net: broadcom: bcm4908_enet: fix RX path possible mem leak

From: Rafał Miłecki <rafal@...ecki.pl>

After filling RX ring slot with new skb it's required to free old skb.
Immediately on error or later in the net subsystem.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 drivers/net/ethernet/broadcom/bcm4908_enet.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/broadcom/bcm4908_enet.c b/drivers/net/ethernet/broadcom/bcm4908_enet.c
index 9be33dc98072..7983c7a9fca9 100644
--- a/drivers/net/ethernet/broadcom/bcm4908_enet.c
+++ b/drivers/net/ethernet/broadcom/bcm4908_enet.c
@@ -570,6 +570,7 @@ static int bcm4908_enet_poll(struct napi_struct *napi, int weight)
 
 		if (len < ETH_ZLEN ||
 		    (ctl & (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) != (DMA_CTL_STATUS_SOP | DMA_CTL_STATUS_EOP)) {
+			kfree_skb(slot.skb);
 			enet->netdev->stats.rx_dropped++;
 			break;
 		}
-- 
2.26.2