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authorLin, Zhenpeng <zplin@psu.edu>2021-09-08 03:40:59 +0000
committerDavid S. Miller <davem@davemloft.net>2021-09-08 11:28:35 +0100
commitd9ea761fdd197351890418acd462c51f241014a7 (patch)
treed0a74cb2a2461ae0b2a870d693053f2551889343 /net/mctp
parent0f31ab217dc52a3044044d416be0248b1778c4da (diff)
dccp: don't duplicate ccid when cloning dccp sock
Commit 2677d2067731 ("dccp: don't free ccid2_hc_tx_sock ...") fixed a UAF but reintroduced CVE-2017-6074. When the sock is cloned, two dccps_hc_tx_ccid will reference to the same ccid. So one can free the ccid object twice from two socks after cloning. This issue was found by "Hadar Manor" as well and assigned with CVE-2020-16119, which was fixed in Ubuntu's kernel. So here I port the patch from Ubuntu to fix it. The patch prevents cloned socks from referencing the same ccid. Fixes: 2677d2067731410 ("dccp: don't free ccid2_hc_tx_sock ...") Signed-off-by: Zhenpeng Lin <zplin@psu.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mctp')
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