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Deadlock in "FLUSH" with curl share interface

From: <>
Date: Sun, 13 Jul 2014 12:03:40 +0900


This issue was reported in
Unfortunately the reporter didn't suggest his patch.

This issue is caused by locking CURL_LOCK_DATA_COOKIE with specified cookie files.
In this case, CURL_LOCK_DATA_COOKIE is locked before executing "FLUSH", and then
Curl_cookie_loadfiles locks CURL_LOCK_DATA_COOKIE. This condition occurs deadlock.
Attached as "fix_deadlock.patch" is to fix this issue.

In addition, a simple function to load cookie files is needed for Curl library.
When libcurl users just want to load their cookie files, they don't need a "FLUSH"
cookie process. So I suggest that "LOAD" should be added as a new function of
CURLOPT_COOKIELIST. I made a patch attached as "add_loadcmd.patch".

These two patches are made from curl 7.36.0.
Please check it.


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Received on 2014-07-13