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<base href="https://bugzilla.netfilter.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - nft check config causes segmentation fault when using variables for devices in the chain"
href="https://bugzilla.netfilter.org/show_bug.cgi?id=1676">1676</a>
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<th>Summary</th>
<td>nft check config causes segmentation fault when using variables for devices in the chain
</td>
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<th>Product</th>
<td>nftables
</td>
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<th>Version</th>
<td>1.0.x
</td>
</tr>
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<th>Hardware</th>
<td>x86_64
</td>
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<th>OS</th>
<td>Debian GNU/Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P5
</td>
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<th>Component</th>
<td>nft
</td>
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<th>Assignee</th>
<td>pablo@netfilter.org
</td>
</tr>
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<th>Reporter</th>
<td>jinesh@onelittlehope.com
</td>
</tr></table>
<p>
<div>
<pre>Setup details:
libnftables1:amd64 1.0.6-2
libnftnl11:amd64 1.2.4-2
nftables 1.0.6-2
Linux debianvm 6.1.0-7-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.20-2
(2023-04-08) x86_64 GNU/Linux
Reproduction steps:
1. Create a test.conf file containing:
---snip---
#!/usr/sbin/nft -f
define lan_interfaces = {eth0}
flush ruleset
table netdev filter {
chain ingress {
type filter hook ingress devices = $lan_interfaces priority -500; policy
accept;
}
}
---snip---
2. Run nft -c -f test.conf
Expect no output as syntax is valid. Instead get a Segmentation fault.
Notes:
- I think the issue is that the lan_interfaces variable cannot have a single
element. It needs to have more than one element. e.g. define lan_interfaces =
{eth0,lo} works fine and no seg fault.
- I also found that define lan_interfaces = {{eth0}} doesn't generate a seg
fault.</pre>
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</p>
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