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Bug 1534721 - backport fix for crash in NetworkManager when calling `ip route get`
Summary: backport fix for crash in NetworkManager when calling `ip route get`
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: NetworkManager
Version: 7.5
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Thomas Haller
QA Contact: Desktop QE
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-01-15 19:45 UTC by Thomas Haller
Modified: 2018-04-10 13:38 UTC (History)
9 users (show)

Fixed In Version: NetworkManager-1.10.2-10.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-04-10 13:37:57 UTC
Target Upstream Version:
Embargoed:


Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2018:0778 0 None None None 2018-04-10 13:38:33 UTC

Description Thomas Haller 2018-01-15 19:45:58 UTC
This fix:

https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=c17315d555c812f8b14d36a34856f8030ecbfdc5

It used the wrong destroy function, which is quite possibly fatal. I didn't actually experience a crash, but I assume it can happen in certain circumstances.

Probably related to activating VPNs, because that is when we call the function.

Comment 4 Thomas Haller 2018-02-05 12:58:48 UTC
No, it was caught as a compiler error when doing https://cgit.freedesktop.org/NetworkManager/NetworkManager/commit/?id=d7025818123631e893948f389ab2ec428359b238

which changes:

-static void
-_nm_auto_nl_msg_cleanup (void *ptr)
+static inline void
+_nm_auto_nl_msg_cleanup (struct nl_msg **ptr)


It could be a bit hard to reproduce, because for that the netlink request RTM_GETROUTE would have to fail, so that we hit the error path and call the wrong free function.

It seems a pretty obvious bug. Dunno how hard it is to reproduce. Anyway, it's clearly fixed now, so SanityOnly seems very fine.

Comment 7 errata-xmlrpc 2018-04-10 13:37:57 UTC
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0778


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