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[EBTABLES]: Deal with the worst-case behaviour in loop checks. 

No need to revisit a chain we'd already finished with during
the check for current hook.  It's either instant loop (which
we'd just detected) or a duplicate work.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Al Viro 2006-11-30 19:24:49 -08:00 committed by David S. Miller
parent 40642f95f5
commit 98a0824a0f
1 changed files with 3 additions and 1 deletions
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4
net/bridge/netfilter/ebtables.c
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@ -717,7 +717,9 @@ static int check_chainloops(struct ebt_entries *chain, struct ebt_cl_stack *cl_s
BUGPRINT("loop\n");
return -1;
}
/* this can't be 0, so the above test is correct */
if (cl_s[i].hookmask & (1 << hooknr))
goto letscontinue;
/* this can't be 0, so the loop test is correct */
cl_s[i].cs.n = pos + 1;
pos = 0;
cl_s[i].cs.e = ((void *)e + e->next_offset);