Subject: Re: [PATCH net-next v3 4/4] net: tcp: reset 'drop_reason' to NOT_SPCIFIED in tcp_v{4,6}_rcv()

From: Jakub Kicinski <[email-masked]>
Date: Thu, 19 May 2022 08:48:51 -0700

On Fri, 13 May 2022 11:03:39 +0800 [email-masked] wrote:
> From: Menglong Dong <[email-masked]>
> 
> The 'drop_reason' that passed to kfree_skb_reason() in tcp_v4_rcv()
> and tcp_v6_rcv() can be SKB_NOT_DROPPED_YET(0), as it is used as the
> return value of tcp_inbound_md5_hash().
> 
> And it can panic the kernel with NULL pointer in
> net_dm_packet_report_size() if the reason is 0, as drop_reasons[0]
> is NULL.
> 
> Fixes: 1330b6ef3313 ("skb: make drop reason booleanable")

This patch is in net, should this fix have been targeting net / 5.18?