[asterisk-dev] [Code Review] 4160: chan_sip: Fix theoretical leak of p->refer

[Mark Michelson]

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If I understand the purpose of p->refer correctly, it's supposed to be details relating to a specific REFER (or REFER-esque in some cases) transaction. I think that any in-dialog places where p->refer may be allocated, the previous p->refer should be freed. In addition to the transmit_refer() change you have, this would mean that handle_request_refer() and get_also_info() should free p->refer and then allocate a new one.

Honestly, the best way to do this is perhaps to just have sip_refer_alloc() destroy the old p->refer and then allocate a new one.

- Mark Michelson


On Nov. 10, 2014, 6:25 a.m., Corey Farrell wrote:
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> (Updated Nov. 10, 2014, 6:25 a.m.)
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> Review request for Asterisk Developers.
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> Bugs: ASTERISK-15242
>     https://issues.asterisk.org/jira/browse/ASTERISK-15242
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> Repository: Asterisk
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> Description
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> If transmit_refer is called when p->refer is already allocated, it will leak the previous allocation.  I checked for all occurrences of sip_refer_alloc, found that transmit_refer was the only caller that didn't check p->refer first.  This change moves the check for !p->refer to sip_refer_alloc.
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> I made transmit_refer destroy any previous p->refer so it will have a clean structure after reallocation like it does currently.  Unsure if it's needed, but the little bit of extra processing is worth keeping this fix low risk.
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> The change is slightly different in 12+, as p->refer->refer_call only exists in 11.
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> Diffs
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>   /branches/11/channels/chan_sip.c 427666 
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> Diff: https://reviewboard.asterisk.org/r/4160/diff/
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> Testing
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> Compiled, visual inspection.
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> Thanks,
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> Corey Farrell
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