[PATCH 0/2] net: dccp: fix structure use-after-free

Kleber Sacilotto de Souza
2020-10-13T17:18:57Z

This patchset addresses the following CVE:

CVE-2020-16119 - DCCP CCID structure use-after-free

Hadar Manor reported that by reusing a socket with an attached
dccps_hc_tx_ccid as a listener, it will be used after being released,
leading to DoS and potentially code execution.

The first patch moves the ccid timers to struct dccp_sock to avoid its
use-after-free, the second patch reverts 2677d2067731 "dccp: don't free
ccid2_hc_tx_sock struct in dccp_disconnect()" that's not needed anymore
and would cause another use-after-free.

Thadeu Lima de Souza Cascardo (2):
dccp: ccid: move timers to struct dccp_sock
Revert "dccp: don't free ccid2_hc_tx_sock struct in dccp_disconnect()"

include/linux/dccp.h | 2 ++
net/dccp/ccids/ccid2.c | 32 +++++++++++++++++++-------------
net/dccp/ccids/ccid3.c | 30 ++++++++++++++++++++----------
net/dccp/proto.c | 2 ++
4 files changed, 43 insertions(+), 23 deletions(-)

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2.25.1