linux-kernel - [PATCH 04/45] rtc: nvmem: disallow registering nvmem more than once

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>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20180212224759.15999-5-alexandre.belloni@bootlin.com>
Date:   Mon, 12 Feb 2018 23:47:18 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     linux-rtc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH 04/45] rtc: nvmem: disallow registering nvmem more than once

Make rtc_nvmem_register return -EBUSY when an nvmem is already registered
for that RTC.

Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
---
 drivers/rtc/nvmem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/rtc/nvmem.c b/drivers/rtc/nvmem.c
index 293df6db7c42..fd1c39a5ade5 100644
--- a/drivers/rtc/nvmem.c
+++ b/drivers/rtc/nvmem.c
@@ -87,6 +87,9 @@ static void rtc_nvram_unregister(struct rtc_device *rtc)
 int rtc_nvmem_register(struct rtc_device *rtc,
 		       struct nvmem_config *nvmem_config)
 {
+	if (!IS_ERR_OR_NULL(rtc->nvmem))
+		return -EBUSY;
+
 	if (!nvmem_config)
 		return -ENODEV;
 
-- 
2.16.1