Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=4f25049106e0507ff21a9e1fc0645d849e19faf0
Commit:     4f25049106e0507ff21a9e1fc0645d849e19faf0
Parent:     0ea9d70df8f8be741ee0525490370de06163d2de
Author:     Patrick McHardy <[EMAIL PROTECTED]>
AuthorDate: Tue Feb 5 16:19:59 2008 -0800
Committer:  David S. Miller <[EMAIL PROTECTED]>
CommitDate: Tue Feb 5 16:19:59 2008 -0800

    [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 <[EMAIL PROTECTED]>
    Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
 net/sched/cls_flow.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/sched/cls_flow.c b/net/sched/cls_flow.c
index 8d76986..eeb223c 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);
-
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