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swh:1:snp:c3bf2749e3476071fa748f67b0ffa2fdc5fe49d9
Revision e1b4b9f3986b80d5785d91dbd8d72cfaf9fd1117 authored by Al Viro on 12 December 2006, 08:29:52 UTC, committed by David S. Miller on 14 December 2006, 00:48:23 UTC 
[NETFILTER]: {ip,ip6,arp}_tables: fix exponential worst-case search for loops
 
If we come to node we'd already marked as seen and it's not a part of path
(i.e. we don't have a loop right there), we already know that it isn't a
part of any loop, so we don't need to revisit it.

That speeds the things up if some chain is refered to from several places
and kills O(exp(table size)) worst-case behaviour (without sleeping,
at that, so if you manage to self-LART that way, you are SOL for a long
time)...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
1 parent a96be24
History
Tip revision: d1221cea11fca0f6946bdd032a45b22cecfc0f99 authored by Linus Torvalds on 13 September 2022, 13:11:38 UTC
Merge tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Tip revision: d1221ce
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REPORTING-BUGS -rw-r--r-- 3.0 KB

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