Description: refcount leak in llcp_sock_bind()
References:
 https://www.openwall.com/lists/oss-security/2020/11/01/1
Notes:
 bwh> Not sure how far back this goes, but 4.9 seems to have the issue.
 bwh> Fix for this introduced CVE-2021-23134.
Bugs:
upstream: released (5.12-rc7) [c33b1cc62ac05c1dbb1cdafe2eb66da01c76ca8d]
5.10-upstream-stable: released (5.10.30) [6fb003e5ae18d8cda4c8a1175d9dd8db12bec049]
4.19-upstream-stable: released (4.19.187) [adbb1d218c5f56dbae052765da83c0f57fce2a31]
4.9-upstream-stable: released (4.9.267) [18013007b596771bf5f5e7feee9586fb0386ad14]
sid: released (5.10.38-1)
4.19-buster-security: released (4.19.194-1)
4.9-stretch-security: released (4.9.272-1)