From: Dan Carpenter <dan.carpenter@linaro.org>
To: Simon Horman <horms@kernel.org>
Cc: "David S. Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: [PATCH net] net: atm: fix use after free in lec_send()
Date: Fri, 14 Mar 2025 13:10:57 +0300 [thread overview]
Message-ID: <c751531d-4af4-42fe-affe-6104b34b791d@stanley.mountain> (raw)
The ->send() operation frees skb so save the length before calling
->send() to avoid a use after free.
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
---
net/atm/lec.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/net/atm/lec.c b/net/atm/lec.c
index ffef658862db..a948dd47c3f3 100644
--- a/net/atm/lec.c
+++ b/net/atm/lec.c
@@ -181,6 +181,7 @@ static void
lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
+ unsigned int len = skb->len;
ATM_SKB(skb)->vcc = vcc;
atm_account_tx(vcc, skb);
@@ -191,7 +192,7 @@ lec_send(struct atm_vcc *vcc, struct sk_buff *skb)
}
dev->stats.tx_packets++;
- dev->stats.tx_bytes += skb->len;
+ dev->stats.tx_bytes += len;
}
static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue)
--
2.47.2
next reply other threads:[~2025-03-14 10:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-03-14 10:10 Dan Carpenter [this message]
2025-03-19 12:39 ` [PATCH net] net: atm: fix use after free in lec_send() Simon Horman
2025-03-20 10:00 ` patchwork-bot+netdevbpf
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