From: Lee Jones lee@kernel.org
[ Upstream commit 04c55383fa5689357bcdd2c8036725a55ed632bc ]
In the event of a failure in tcf_change_indev(), u32_set_parms() will immediately return without decrementing the recently incremented reference counter. If this happens enough times, the counter will rollover and the reference freed, leading to a double free which can be used to do 'bad things'.
In order to prevent this, move the point of possible failure above the point where the reference counter is incremented. Also save any meaningful return values to be applied to the return data at the appropriate point in time.
This issue was caught with KASAN.
Fixes: 705c7091262d ("net: sched: cls_u32: no need to call tcf_exts_change for newly allocated struct") Suggested-by: Eric Dumazet edumazet@google.com Signed-off-by: Lee Jones lee@kernel.org Reviewed-by: Eric Dumazet edumazet@google.com Acked-by: Jamal Hadi Salim jhs@mojatatu.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- net/sched/cls_u32.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/net/sched/cls_u32.c b/net/sched/cls_u32.c index 5d30db0d71574..0025fa837e857 100644 --- a/net/sched/cls_u32.c +++ b/net/sched/cls_u32.c @@ -716,12 +716,18 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp, struct nlattr *est, u32 flags, struct netlink_ext_ack *extack) { - int err; + int err, ifindex = -1;
err = tcf_exts_validate(net, tp, tb, est, &n->exts, flags, extack); if (err < 0) return err;
+ if (tb[TCA_U32_INDEV]) { + ifindex = tcf_change_indev(net, tb[TCA_U32_INDEV], extack); + if (ifindex < 0) + return -EINVAL; + } + if (tb[TCA_U32_LINK]) { u32 handle = nla_get_u32(tb[TCA_U32_LINK]); struct tc_u_hnode *ht_down = NULL, *ht_old; @@ -756,13 +762,9 @@ static int u32_set_parms(struct net *net, struct tcf_proto *tp, tcf_bind_filter(tp, &n->res, base); }
- if (tb[TCA_U32_INDEV]) { - int ret; - ret = tcf_change_indev(net, tb[TCA_U32_INDEV], extack); - if (ret < 0) - return -EINVAL; - n->ifindex = ret; - } + if (ifindex >= 0) + n->ifindex = ifindex; + return 0; }