Bill Meier
changed
bug 8043
| What |
Removed |
Added |
| Summary |
Ethernet/VLAN/MPLS/IPv4/ICMP infinite loop
|
Ethernet/VLAN/MPLS/IPv4/ICMP: very very large loop
|
Comment # 8
on bug 8043
from Bill Meier
In the (presumably handcrafted!) cap file ipv4.pcap (attachment #1 [details])
the layers are:
ethernet
vlan
vlan
mpls
[ repeated about 20+ times:
ethernet
vlan
mpls
}
ethernet
ip
icmp
The bug is somewhat interesting:
A MPLS payload starting with a valid-looking ethernet address is
dissected (and added to the tree) twice: once as ethernet and then again as
pw-eth-cw (or pw-eth-nocw).
So: the effect is that the lowest-level MPLS payload is dissected (and added to
the tree) 2*N times where N is the number of MPLS layers in the frame.
In this case, about 2*22 times (4,194,304) !
So: the loop is not infinite. :)
-------
Attachments #2 & #3 are similar (many layers of MPLS) with the same issue.
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