CVE-2021-46998: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit

First published: Wed Feb 28 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: ethernet:enic: Fix a use after free bug in enic_hard_start_xmit In enic_hard_start_xmit, it calls enic_queue_wq_skb(). Inside enic_queue_wq_skb, if some error happens, the skb will be freed by dev_kfree_skb(skb). But the freed skb is still used in skb_tx_timestamp(skb). My patch makes enic_queue_wq_skb() return error and goto spin_unlock() incase of error. The solution is provided by Govind. See https://lkml.org/lkml/2021/4/30/961.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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