kern/134557: [netgraph] [hang] 7.2 with mpd5.3 hanging up - ng_pptp problem

[Mikolaj Golub]

Unfortunately, the problem was introduced by this commit :-)

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Author: 	mav
Date: 	Sat Jan 31 12:48:09 2009 UTC (4 months, 4 weeks ago)
Log Message: 	

MFC rev. 187495

Check for infinite recursion possible on some broken PPTP/L2TP/... VPN setups.
Mark packets with mbuf_tag on first interface passage and drop on second.

PR:		ports/129625, ports/125303

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If a packet goes through two or more ng interfaces, "while" loop in the tag
checking code can run infinitely. The attached patch should fix this.

-- 
Mikolaj Golub

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