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[NET_SCHED]: cls_flow: fix key mask validity check

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Since we're using fls(), we need to check whether the value is
non-zero first.

Signed-off-by: Patrick McHardy <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Patrick McHardy 2008-02-05 16:19:59 -08:00 • committed by David S. Miller
commit 4f25049106
1 changed files with 3 additions and 2 deletions
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5
net/sched/cls_flow.c
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@ -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);