[asterisk-dev] [Code Review] Fix a crash in res_ais

[rmudgett]

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Ship it!


Description and code match.  Looks ok to me.

- rmudgett


On Sept. 8, 2011, 7:31 p.m., Russell Bryant wrote:
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> (Updated Sept. 8, 2011, 7:31 p.m.)
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> 
> Review request for Asterisk Developers.
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> Summary
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> This patch resolves a crash observed in a load testing environment that
> involved the use of the res_ais module.  I observed some crashes where
> the event delivery callback would get called, but the length parameter
> incidcating how much data there was to read was 0.  The code assumed
> (with good reason I would think) that if this callback got called, there
> was an event available to read.  However, if the rare case that there's
> nothing there, catch it and return instead of blowing up.
> 
> More specifically, the change always ensure that the size of the received
> event in the cluster is always big enough to be a real ast_event.
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> 
> Diffs
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>   /branches/1.8/include/asterisk/event.h 335012 
>   /branches/1.8/main/event.c 335012 
>   /branches/1.8/res/ais/evt.c 335012 
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> Diff: https://reviewboard.asterisk.org/r/1423/diff
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> Testing
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> I ran about 120,000 calls through a couple of systems that had this patch.
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> Thanks,
> 
> Russell
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>

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