Change in openbsc[master]: bsc_nat: Fix crash (double-free) in forward_sccp_to_msc

[Pau Espin Pedrol]

Hello Daniel Willmann, Harald Welte, Jenkins Builder, 

I'd like you to reexamine a change. Please visit

    https://gerrit.osmocom.org/13837

to look at the new patch set (#2).

Change subject: bsc_nat: Fix crash (double-free) in forward_sccp_to_msc
......................................................................

bsc_nat: Fix crash (double-free) in forward_sccp_to_msc

In bsc_nat_parse(), parsed is allocated this way:
"""parsed = talloc_zero(msg, struct bsc_nat_parsed);"""
So parsed is a child of msg, and so it's freed when msg is freed.

Since libosmocore c7f52c4c84d6a8898048738c4db9266289c40b45,
osmo_wqueue_enqueue() correctly detects queue full and returns an error,
and then queue_for_msc() calls msgb_free(). Code in osmo-bsc-nat was
probably written before that change in behavior, so that's why probably
the bug was not hit before.

The "if (parsed)" condition is removed since it's actually fine to
talloc_free(NULL).

Related: SYS#4548
Change-Id: I209d3e2d809a67915ec43c874e68f7f746a565f0
---
M openbsc/src/osmo-bsc_nat/bsc_nat.c
1 file changed, 2 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/openbsc refs/changes/37/13837/2
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Gerrit-Project: openbsc
Gerrit-Branch: master
Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I209d3e2d809a67915ec43c874e68f7f746a565f0
Gerrit-Change-Number: 13837
Gerrit-PatchSet: 2
Gerrit-Owner: Pau Espin Pedrol <pespin at sysmocom.de>
Gerrit-Reviewer: Daniel Willmann <dwillmann at sysmocom.de>
Gerrit-Reviewer: Harald Welte <laforge at gnumonks.org>
Gerrit-Reviewer: Jenkins Builder (1000002)
Gerrit-Reviewer: Pau Espin Pedrol <pespin at sysmocom.de>
Gerrit-CC: Holger Freyther <holger at freyther.de>
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