Re: [PATCH 2/2] Revert "dccp: don't free ccid2_hc_tx_sock struct in dccp_disconnect()"

[Jakub Kicinski]

On Tue, 13 Oct 2020 19:18:49 +0200 Kleber Sacilotto de Souza wrote:
> From: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
> 
> This reverts commit 2677d20677314101293e6da0094ede7b5526d2b1.
> 
> This fixes an issue that after disconnect, dccps_hc_tx_ccid will still be
> kept, allowing the socket to be reused as a listener socket, and the cloned
> socket will free its dccps_hc_tx_ccid, leading to a later use after free,
> when the listener socket is closed.
> 
> This addresses CVE-2020-16119.
> 
> Fixes: 2677d2067731 (dccp: don't free ccid2_hc_tx_sock struct in dccp_disconnect())
> Reported-by: Hadar Manor

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> Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@xxxxxxxxxxxxx>
> Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@xxxxxxxxxxxxx>