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* luci/libs: properly handle overflows in luci.ip.add()

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This commit is contained in:
Jo-Philipp Wich 2008-08-08 13:45:09 +00:00
parent e502d88407
commit a87b197aa8
1 changed files with 3 additions and 1 deletions
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4
libs/core/luasrc/ip.lua
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@ -382,8 +382,10 @@ function cidr.add( self, amount )
local add = ( #shorts > 0 ) and table.remove( shorts, #shorts ) or 0
if ( data[pos] + add ) > 0xFFFF then
data[pos] = ( data[pos] + add ) % 0xFFFF
if pos > 2 then
if pos > 1 then
data[pos-1] = data[pos-1] + ( add - data[pos] )
else
return nil
end
else
data[pos] = data[pos] + add