From: Davide Caratti Date: Mon, 19 Mar 2018 14:31:22 +0000 (+0100) Subject: net/sched: fix idr leak on the error path of tcf_bpf_init() X-Git-Tag: v4.14.45~217 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=29e36c3099fc2e3064068508ced39a702d1815b9;p=platform%2Fkernel%2Flinux-rpi.git net/sched: fix idr leak on the error path of tcf_bpf_init() [ Upstream commit bbc09e7842a5023ba5bc0f8d559b9dd464e44006 ] when the following command sequence is entered # tc action add action bpf bytecode '4,40 0 0 12,31 0 1 2048,6 0 0 262144,6 0 0 0' index 100 RTNETLINK answers: Invalid argument We have an error talking to the kernel # tc action add action bpf bytecode '4,40 0 0 12,21 0 1 2048,6 0 0 262144,6 0 0 0' index 100 RTNETLINK answers: No space left on device We have an error talking to the kernel act_bpf correctly refuses to install the first TC rule, because 31 is not a valid instruction. However, it refuses to install the second TC rule, even if the BPF code is correct. Furthermore, it's no more possible to install any other rule having the same value of 'index' until act_bpf module is unloaded/inserted again. After the idr has been reserved, call tcf_idr_release() instead of tcf_idr_cleanup(), to fix this issue. Fixes: 65a206c01e8e ("net/sched: Change act_api and act_xxx modules to use IDR") 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 --- diff --git a/net/sched/act_bpf.c b/net/sched/act_bpf.c index 2b08762..364a878 100644 --- a/net/sched/act_bpf.c +++ b/net/sched/act_bpf.c @@ -356,7 +356,7 @@ static int tcf_bpf_init(struct net *net, struct nlattr *nla, return res; out: if (res == ACT_P_CREATED) - tcf_idr_cleanup(*act, est); + tcf_idr_release(*act, bind); return ret; }