This bug was fixed in the package iproute2 - 4.15.0-2ubuntu1.3
---------------
iproute2 (4.15.0-2ubuntu1.3) bionic; urgency=medium
* Fix: NULL dereference when rendering without header (LP: #1913187)
- d/p/lp1913187-ss-fix-NULL-dereference-when-rendering.patch
-- Rafael David Tinoco <rafaeldtin...@ubuntu.com> Tue, 26 Jan 2021
13:33:08 +0000
** Changed in: iproute2 (Ubuntu Bionic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1913187
Title:
iproute2 segfaults when filtering sockets
Status in iproute2 package in Ubuntu:
Fix Released
Status in iproute2 source package in Bionic:
Fix Released
Bug description:
[Impact]
* The ss tool crashes when a query returns no results (seg fault)
[Test Case]
* $ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst
127.0.0.1
Segmentation fault
* PPA with the fix:
https://launchpad.net/~rafaeldtinoco/+archive/ubuntu/lp1913187
[Where problems could occur]
* The ss tool is impacted and it has its code changed for the fix.
* The fix is a clean cherry-pick and straightforward (moving
declaration after a NULL check).
[Other Info]
When in Ubuntu Bionic, if one calls:
$ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst 127.0.0.1
tcp 0 0
127.0.0.1:58910 127.0.0.1:22
users:(("ssh",pid=11672,fd=3)) timer:(keepalive,119min,0)
it works. Just like when in Groovy:
$ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst 127.0.0.1
tcp 0 0
127.0.0.1:58908 127.0.0.1:22
users:(("ssh",pid=1488591,fd=3)) timer:(keepalive,119min,0)
but.. if there is nothing to show, in Bionic we get a segfault:
$ sudo ss -Hnp -o state established 'dport = 22' src 127.0.0.1 dst 127.0.0.1
Segmentation fault
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