[asterisk-dev] [Code Review] Correct message array allocation issues in app_voicemail

[Mark Michelson]

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branches/1.8/apps/app_voicemail.c
<https://reviewboard.asterisk.org/r/1994/#comment12289>

    You should probably put this inside the if block above. It doesn't hurt to have it here, but it makes more sense in the if block.



branches/1.8/apps/app_voicemail.c
<https://reviewboard.asterisk.org/r/1994/#comment12290>

    This is an area where I think you might run into an issue, but only if IMAP storage is in use.
    
    With ODBC and file storage, vm_state variables are always local variables, and so synchronization across threads is not an issue to consider.
    
    With IMAP, on the other hand, the vm_state that you are operating on may be local to the stack, thread-local, or it could be a pointing to a persistent vm_state in a global list. That being said, here in close_mailbox(), this modification of vms->dh_arraysize (as well as its access earlier in the function) is not protected by a lock. The result is that you could end up with badness due to competing threads mucking around with the data. The modifications/accesses of vms->dh_arraysize in open_mailbox() and vm_allocate_dh() are lock-protected.


- Mark


On June 20, 2012, 8:18 a.m., opticron wrote:
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> This is an automatically generated e-mail. To reply, visit:
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> (Updated June 20, 2012, 8:18 a.m.)
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> Review request for Asterisk Developers.
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> Summary
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> This patch reworks the handling of array allocation and freeing to ensure that freed memory is not used.
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> This addresses bug AST-894.
>     https://issues.asterisk.org/jira/browse/AST-894
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> Diffs
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>   branches/1.8/apps/app_voicemail.c 368806 
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> Diff: https://reviewboard.asterisk.org/r/1994/diff
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> Testing
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> Poked through voicemail manually.  Testing has been performed on issue ASTERISK-19923 and seems to have corrected the segfault in that case.
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> Thanks,
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> opticron
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>

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