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drivers/net/wan/hdlc_fr: Fix a double free in pvc_xmit

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[ Upstream commit 1b479fb801602b22512f53c19b1f93a4fc5d5d9d ]

In pvc_xmit, if __skb_pad(skb, pad, false) failed, it will free
the skb in the first time and goto drop. But the same skb is freed
by kfree_skb(skb) in the second time in drop.

Maintaining the original function unchanged, my patch adds a new
label out to avoid the double free if __skb_pad() failed.

Fixes: f5083d0cee08a ("drivers/net/wan/hdlc_fr: Improvements to the code of pvc_xmit")
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Lv Yunlong 2021-03-28 00:50:08 -07:00 committed by Greg Kroah-Hartman
parent d38bce5adc
commit d9670f5e77
1 changed files with 3 additions and 2 deletions
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5
drivers/net/wan/hdlc_fr.c
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@ -415,7 +415,7 @@ static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
if (pad > 0) { /* Pad the frame with zeros */
if (__skb_pad(skb, pad, false))
goto drop;
goto out;
skb_put(skb, pad);
}
}
@ -448,8 +448,9 @@ static netdev_tx_t pvc_xmit(struct sk_buff *skb, struct net_device *dev)
return NETDEV_TX_OK;
drop:
dev->stats.tx_dropped++;
kfree_skb(skb);
out:
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}