linux-kernel - [PATCH] auxdisplay: ks0108: initialize local parport variable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-Id: <1439472965-29153-1-git-send-email-sudipm.mukherjee@gmail.com>
Date:	Thu, 13 Aug 2015 19:06:05 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Miguel Ojeda Sandonis <miguel.ojeda.sandonis@...il.com>,
	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, fengguang.wu@...el.com,
	Sudip Mukherjee <sudipm.mukherjee@...il.com>
Subject: [PATCH] auxdisplay: ks0108: initialize local parport variable

The local variable ks0108_parport is used by other functions to write to
the parallel port. We missed initializing it when we converted the
driver to use new Parallel Port codes.

Fixes: 4edd70c133f3 ("auxdisplay: ks0108: use new parport device model")
Reported-by: Fengguang Wu <fengguang.wu@...el.com>
Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---

Tested on kvm with the script provided by Fengguang Wu to reproduce the
error.

 drivers/auxdisplay/ks0108.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/auxdisplay/ks0108.c b/drivers/auxdisplay/ks0108.c
index 4c471bd..816de9e 100644
--- a/drivers/auxdisplay/ks0108.c
+++ b/drivers/auxdisplay/ks0108.c
@@ -146,6 +146,7 @@ static void ks0108_parport_attach(struct parport *port)
 		goto err_unreg_device;
 	}
 
+	ks0108_parport = port;
 	ks0108_inited = 1;
 	return;
 
@@ -167,6 +168,7 @@ static void ks0108_parport_detach(struct parport *port)
 	parport_release(ks0108_pardevice);
 	parport_unregister_device(ks0108_pardevice);
 	ks0108_pardevice = NULL;
+	ks0108_parport = NULL;
 }
 
 /*
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/