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To:     netfilter-devel@vger.kernel.org
From:   Eugene Crosser <crosser@average.org>
Subject: Python bindings crash when more than one Nftables is instantiated
Message-ID: <5dcf2dd4-0fdf-30d7-6588-1e571c486289@average.org>
Date:   Tue, 14 Sep 2021 19:46:16 +0200
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From: Eugene Crosser <crosser@average.org>
To: netfilter-devel@vger.kernel.org
Message-ID: <5dcf2dd4-0fdf-30d7-6588-1e571c486289@average.org>
Subject: Python bindings crash when more than one Nftables is instantiated

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Hello,

it seems to me that this should not be happening. Use case is not as
pathological as it may seem: your program may be using different third pa=
rty
modules, each of them instantiate `Nftables` interface.

$ sudo python
[sudo] password for echerkashin:
Python 3.9.7 (default, Sep  3 2021, 06:18:44)
[GCC 11.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from nftables import Nftables
>>> n1=3DNftables()
>>> n2=3DNftables()
>>> <Ctrl-D>
double free or corruption (top)
Aborted

Note that it happens on exit (possibly on the second call to __del__()).

nftables v0.9.9

Regards,

Eugene


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