From b6553c71813f57b1bfa775af120169c549f7f090 Mon Sep 17 00:00:00 2001
From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 21 Feb 2022 13:54:40 +0300
Subject: [PATCH] net: dm9051: Fix use after free in dm9051_loop_tx()
This code dereferences "skb" after calling dev_kfree_skb().
Fixes: 2dc95a4d30ed ("net: Add dm9051 driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20220221105440.GA10045@kili
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
drivers/net/ethernet/davicom/dm9051.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/davicom/dm9051.c b/drivers/net/ethernet/davicom/dm9051.c
index 6a2bcfbfe891d..b4b5c9c2a743a 100644
--- a/drivers/net/ethernet/davicom/dm9051.c
+++ b/drivers/net/ethernet/davicom/dm9051.c
@@ -845,17 +845,19 @@ static int dm9051_loop_tx(struct board_info *db)
while (!skb_queue_empty(&db->txq)) {
struct sk_buff *skb;
+ unsigned int len;
skb = skb_dequeue(&db->txq);
if (skb) {
ntx++;
ret = dm9051_single_tx(db, skb->data, skb->len);
+ len = skb->len;
dev_kfree_skb(skb);
if (ret < 0) {
db->bc.tx_err_counter++;
return 0;
}
- ndev->stats.tx_bytes += skb->len;
+ ndev->stats.tx_bytes += len;
ndev->stats.tx_packets++;
}
--
2.39.5