Vulnerability CVE-2021-46998
Published: 2024-02-28

Description:
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.

 References:
https://git.kernel.org/stable/c/25a87b1f566b5eb2af2857a928f0e2310d900976
https://git.kernel.org/stable/c/f7f6f07774091a6ddd98500b85386c3c6afb30d3
https://git.kernel.org/stable/c/7afdd6aba95c8a526038e7abe283eeac3e4320f1
https://git.kernel.org/stable/c/6892396ebf04ea2c021d80e10f4075e014cd7cc3
https://git.kernel.org/stable/c/d90529392aaf498dafa95d212295d64b2cea4e24
https://git.kernel.org/stable/c/643001b47adc844ae33510c4bb93c236667008a3
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