From 4f25049106e0507ff21a9e1fc0645d849e19faf0 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Tue, 5 Feb 2008 16:19:59 -0800 Subject: [PATCH] [NET_SCHED]: cls_flow: fix key mask validity check Since we're using fls(), we need to check whether the value is non-zero first. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/sched/cls_flow.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c index 8d7698621f0a..eeb223cf14cf 100644 --- a/net/sched/cls_flow.c +++ b/net/sched/cls_flow.c @@ -402,12 +402,13 @@ static int flow_change(struct tcf_proto *tp, unsigned long base, if (tb[TCA_FLOW_KEYS]) { keymask = nla_get_u32(tb[TCA_FLOW_KEYS]); - if (fls(keymask) - 1 > FLOW_KEY_MAX) - return -EOPNOTSUPP; nkeys = hweight32(keymask); if (nkeys == 0) return -EINVAL; + + if (fls(keymask) - 1 > FLOW_KEY_MAX) + return -EOPNOTSUPP; } err = tcf_exts_validate(tp, tb, tca[TCA_RATE], &e, &flow_ext_map); -- 2.20.1