[asterisk-bugs] [JIRA] (ASTERISK-24357) [fax] Out of bounds error in update_modem_bits

[Richard Mudgett (JIRA)]

     [ https://issues.asterisk.org/jira/browse/ASTERISK-24357?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Richard Mudgett updated ASTERISK-24357:
---------------------------------------

    Status: Open  (was: Triage)

> [fax] Out of bounds error in update_modem_bits
> ----------------------------------------------
>
>                 Key: ASTERISK-24357
>                 URL: https://issues.asterisk.org/jira/browse/ASTERISK-24357
>             Project: Asterisk
>          Issue Type: Bug
>      Security Level: None
>          Components: Resources/res_fax
>    Affects Versions: 11.13.0
>            Reporter: Jeremy Lainé
>         Attachments: res_fax_bounds.patch
>
>
> The update_modem_bits function in res_fax.c suffers from an out of bounds error : it allocates an array "m" of size 5, but can potentially write 6 entries to the array, counting the final NULL value.
> As there are only 4 valid values (v17, v27, v29 and v34) for modems, the loop should stop iterating one item earlier.
> Putting 5 items or more in the "modems" line of res_fax.conf crashes asterisk, for instance:
> modems=v17,v27,v29,v34,v17
> The attached patch fixes the problem.



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