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Description: net: dccp: fix structure use-after-free
References:
https://www.openwall.com/lists/oss-security/2020/10/13/7
https://lore.kernel.org/netdev/20201013171849.236025-1-kleber.souza@canonical.com/T/
Notes:
carnil> Introduced with 2677d2067731 ("dccp: don't free
carnil> ccid2_hc_tx_sock struct in dccp_disconnect()") in 4.17-rc7 (and
carnil> backported as well to various stable series as e.g. 4.9.108).
Bugs:
upstream: needed
4.19-upstream-stable: needed
4.9-upstream-stable: needed
sid: needed
4.19-buster-security: needed
4.9-stretch-security: needed
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