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Stop parsing on a zero-length packet option #3373

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Stop parsing on a zero-length packet option #3373

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8 changes: 5 additions & 3 deletions nselib/packet.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -686,10 +686,7 @@ function Packet:parse_options(offset, length)
local opt_ptr = 0
while opt_ptr < length do
local t, l, d
options[op] = {}

t = self:u8(offset + opt_ptr)
options[op].type = t
if t==0 or t==1 then
l = 1
d = nil
Expand All @@ -699,6 +696,11 @@ function Packet:parse_options(offset, length)
d = self:raw(offset + opt_ptr + 2, l-2)
end
end
if l==0 then
break
end
options[op] = {}
options[op].type = t
options[op].len = l
options[op].data = d
opt_ptr = opt_ptr + l
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