[Asterisk-code-review] sched: AST_SCHED_REPLACE_UNREF can lead to use after free of data (asterisk[16])

[Alexei Gradinari]

Hello Friendly Automation, Richard Mudgett, 

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

    https://gerrit.asterisk.org/c/asterisk/+/15038

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

Change subject: sched: AST_SCHED_REPLACE_UNREF can lead to use after free of data
......................................................................

sched: AST_SCHED_REPLACE_UNREF can lead to use after free of data

The data can be freed if the old object '_data' is the same object as new
'data'. Because at first the object is unreferenced wihch can lead to
destroying it.

This could happened in res_pjsip_pubsub when the publication is updated
which could lead to segfault in function publish_expire.

Change-Id: I0164f57c387243510bdbd2f8dcf33377b6c202da
---
M include/asterisk/sched.h
1 file changed, 3 insertions(+), 2 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/38/15038/2
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Gerrit-Project: asterisk
Gerrit-Branch: 16
Gerrit-Change-Id: I0164f57c387243510bdbd2f8dcf33377b6c202da
Gerrit-Change-Number: 15038
Gerrit-PatchSet: 2
Gerrit-Owner: Alexei Gradinari <alex2grad at gmail.com>
Gerrit-Reviewer: Friendly Automation
Gerrit-Reviewer: Richard Mudgett <rmudgett at digium.com>
Gerrit-MessageType: newpatchset
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