netdev - Regression with 5dcd8400884c ("macsec: missing dev_put() on error in macsec

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Message-ID: <9a3a84ff-1fd1-c063-0c50-a297d29a692b@redhat.com>
Date:   Sat, 14 Apr 2018 10:56:55 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>,
        "David S. Miller" <davem@...emloft.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev@...r.kernel.org
Subject: Regression with 5dcd8400884c ("macsec: missing dev_put() on error in
 macsec_newlink()")

Hi,

Fedora got a bug report of a regression when trying to remove the
the macsec module (https://bugzilla.redhat.com/show_bug.cgi?id=1566410).
I did a bisect and found

commit 5dcd8400884cc4a043a6d4617e042489e5d566a9
Author: Dan Carpenter <dan.carpenter@...cle.com>
Date:   Wed Mar 21 11:09:01 2018 +0300

     macsec: missing dev_put() on error in macsec_newlink()
     
     We moved the dev_hold(real_dev); call earlier in the function but forgot
     to update the error paths.
     
     Fixes: 0759e552bce7 ("macsec: fix negative refcnt on parent link")
     Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
     Signed-off-by: David S. Miller <davem@...emloft.net>

The script I used for testing based on the reporter is attached. It
looks like modprobe is stuck in the D state. Any idea?

Thanks,
Laura

Download attachment "mac-sec-setup.sh" of type "application/x-shellscript" (2123 bytes)