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Avoid dereference of null variable
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@ -1734,7 +1734,7 @@ sub match_source_dev( $ ) {
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my $interface = shift;
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return '' if $interface eq '+';
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my $interfaceref = known_interface( $interface );
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my $physical = $interfaceref->{physical};
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my $physical = $interfaceref ? $interfaceref->{physical} : $interface;
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if ( $interfaceref && $interfaceref->{options}{port} ) {
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"-i $interfaceref->{bridge} -m physdev --physdev-in $physical ";
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} else {
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@ -1749,7 +1749,7 @@ sub match_dest_dev( $ ) {
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my $interface = shift;
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return '' if $interface eq '+';
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my $interfaceref = known_interface( $interface );
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my $physical = $interfaceref->{physical};
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my $physical = $interfaceref ? $interfaceref->{physical} : $interface;
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if ( $interfaceref && $interfaceref->{options}{port} ) {
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if ( $capabilities{PHYSDEV_BRIDGE} ) {
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"-o $interfaceref->{bridge} -m physdev --physdev-is-bridged --physdev-out $physical ";
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