Lv Yunlong 6d72e7c767 net:emac/emac-mac: Fix a use after free in emac_mac_tx_buf_send
In emac_mac_tx_buf_send, it calls emac_tx_fill_tpd(..,skb,..).
If some error happens in emac_tx_fill_tpd(), the skb will be freed via
dev_kfree_skb(skb) in error branch of emac_tx_fill_tpd().
But the freed skb is still used via skb->len by netdev_sent_queue(,skb->len).

As i observed that emac_tx_fill_tpd() haven't modified the value of skb->len,
thus my patch assigns skb->len to 'len' before the possible free and
use 'len' instead of skb->len later.

Fixes: b9b17debc6 ("net: emac: emac gigabit ethernet controller driver")
Signed-off-by: Lv Yunlong <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
2021-04-26 13:07:30 -07:00
2021-01-24 14:27:20 +01:00
2021-04-16 16:10:37 -07:00
2021-04-09 14:54:23 -07:00
2021-02-26 09:41:03 -08:00
2021-04-11 15:16:13 -07:00

Linux kernel
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