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Re: [Bug-readline] [BUG] a race condition in add_history() leads to SIGS

From: Chet Ramey
Subject: Re: [Bug-readline] [BUG] a race condition in add_history() leads to SIGSEGV
Date: Mon, 5 Dec 2016 10:35:06 -0500
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.5.0

On 12/4/16 7:42 PM, Hong Cho wrote:

> The race condition is that “history_length” gets updated before the
> “the_history” update is completed.
> In several cases we’ve encountered, “bash” got a signal (SIGHUP), which
> interrupted add_history(), leaving “the_history” and “history_length”
> inconsistent. In the signal handling path, it tried to access “the_history”
> in history_do_write() in histfile.c, which tried to de-reference a NULL
> pointer.

Thanks for the report.  This looks like a good fix.


``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/

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