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GitWeb","url":"https://github.com/LineageOS/android_kernel_samsung_exynos5420/commit/aba85b343defa1f0fb772dfd81554cb3805950c7"}]}],"author":{"name":"Guillaume Nault","email":"g.nault@alphalink.fr","date":"2020-04-02 17:32:50.000000000","tz":60},"committer":{"name":"Vasyl Gello","email":"vasek.gello@gmail.com","date":"2020-09-11 08:01:31.000000000","tz":0},"subject":"l2tp: fix race between l2tp_session_delete() and l2tp_tunnel_closeall()","message":"l2tp: fix race between l2tp_session_delete() and l2tp_tunnel_closeall()\n\ncommit b228a94066406b6c456321d69643b0d7ce11cfa6 upstream.\n\nThere are several ways to remove L2TP sessions:\n\n  * deleting a session explicitly using the netlink interface (with\n    L2TP_CMD_SESSION_DELETE),\n  * deleting the session\u0027s parent tunnel (either by closing the\n    tunnel\u0027s file descriptor or using the netlink interface),\n  * closing the PPPOL2TP file descriptor of a PPP pseudo-wire.\n\nIn some cases, when these methods are used concurrently on the same\nsession, the session can be removed twice, leading to use-after-free\nbugs.\n\nThis patch adds a \u0027dead\u0027 flag, used by l2tp_session_delete() and\nl2tp_tunnel_closeall() to prevent them from stepping on each other\u0027s\ntoes.\n\nThe session deletion path used when closing a PPPOL2TP file descriptor\ndoesn\u0027t need to be adapted. It already has to ensure that a session\nremains valid for the lifetime of its PPPOL2TP file descriptor.\nSo it takes an extra reference on the session in the -\u003esession_close()\ncallback (pppol2tp_session_close()), which is eventually dropped\nin the -\u003esk_destruct() callback of the PPPOL2TP socket\n(pppol2tp_session_destruct()).\nStill, __l2tp_session_unhash() and l2tp_session_queue_purge() can be\ncalled twice and even concurrently for a given session, but thanks to\nproper locking and re-initialisation of list fields, this is not an\nissue.\n\nSigned-off-by: Guillaume Nault \u003cg.nault@alphalink.fr\u003e\nSigned-off-by: David S. 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