From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Cong Wang , Jamal Hadi Salim , Davide Caratti , "David S. Miller" , Sasha Levin Subject: [PATCH 4.14 280/496] net/sched: fix idr leak in the error path of tcf_simp_init() Date: Mon, 28 May 2018 12:01:05 +0200 Message-Id: <20180528100331.649896896@linuxfoundation.org> In-Reply-To: <20180528100319.498712256@linuxfoundation.org> References: <20180528100319.498712256@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Davide Caratti [ Upstream commit 60e10b3adc3bac0f6a894c28e0eb1f2d13607362 ] if the kernel fails to duplicate 'sdata', creation of a new action fails with -ENOMEM. However, subsequent attempts to install the same action using the same value of 'index' systematically fail with -ENOSPC, and that value of 'index' will no more be usable by act_simple, until rmmod / insmod of act_simple.ko is done: # tc actions add action simple sdata hello index 100 # tc actions list action simple action order 0: Simple index 100 ref 1 bind 0 # tc actions flush action simple # tc actions add action simple sdata hello index 100 RTNETLINK answers: Cannot allocate memory We have an error talking to the kernel # tc actions flush action simple # tc actions add action simple sdata hello index 100 RTNETLINK answers: No space left on device We have an error talking to the kernel # tc actions add action simple sdata hello index 100 RTNETLINK answers: No space left on device We have an error talking to the kernel ... Fix this in the error path of tcf_simp_init(), calling tcf_idr_release() in place of tcf_idr_cleanup(). Fixes: 65a206c01e8e ("net/sched: Change act_api and act_xxx modules to use IDR") Suggested-by: Cong Wang Acked-by: Jamal Hadi Salim Signed-off-by: Davide Caratti Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/sched/act_simple.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/sched/act_simple.c +++ b/net/sched/act_simple.c @@ -121,7 +121,7 @@ static int tcf_simp_init(struct net *net d = to_defact(*a); ret = alloc_defdata(d, defdata); if (ret < 0) { - tcf_idr_cleanup(*a, est); + tcf_idr_release(*a, bind); return ret; } d->tcf_action = parm->action;