From: Walter Harms <wharms@bfs.de>
To: Colin King <colin.king@canonical.com>,
Alessandro Zummo <a.zummo@towertech.it>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Guenter Roeck <linux@roeck-us.net>,
Chris Packham <chris.packham@alliedtelesis.co.nz>,
"linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>
Cc: "kernel-janitors@vger.kernel.org"
<kernel-janitors@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: AW: [PATCH][next] rtc: ds1307: check for failed memory allocation on wdt
Date: Thu, 2 Apr 2020 13:40:49 +0000 [thread overview]
Message-ID: <54a09b5502ee45e9a926a025ae576498@bfs.de> (raw)
In-Reply-To: <20200402131441.539088-1-colin.king@canonical.com>
________________________________________
Von: kernel-janitors-owner@vger.kernel.org <kernel-janitors-owner@vger.kernel.org> im Auftrag von Colin King <colin.king@canonical.com>
Gesendet: Donnerstag, 2. April 2020 15:14
An: Alessandro Zummo; Alexandre Belloni; Guenter Roeck; Chris Packham; linux-rtc@vger.kernel.org
Cc: kernel-janitors@vger.kernel.org; linux-kernel@vger.kernel.org
Betreff: [PATCH][next] rtc: ds1307: check for failed memory allocation on wdt
From: Colin Ian King <colin.king@canonical.com>
Currently a failed memory allocation will lead to a null pointer
dereference on point wdt. Fix this by checking for a failed allocation
and adding error return handling to function ds1307_wdt_register.
Addresses-Coverity: ("Dereference null return")
Fixes: fd90d48db037 ("rtc: ds1307: add support for watchdog timer on ds1388")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
drivers/rtc/rtc-ds1307.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index fad042118862..95c5b6facc59 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -1665,14 +1665,16 @@ static const struct watchdog_ops ds1388_wdt_ops = {
};
-static void ds1307_wdt_register(struct ds1307 *ds1307)
+static int ds1307_wdt_register(struct ds1307 *ds1307)
{
struct watchdog_device *wdt;
if (ds1307->type != ds_1388)
- return;
+ return 0;
wdt = devm_kzalloc(ds1307->dev, sizeof(*wdt), GFP_KERNEL);
+ if (!wdt)
+ return -ENOMEM;
wdt->info = &ds1388_wdt_info;
wdt->ops = &ds1388_wdt_ops;
@@ -1683,10 +1685,13 @@ static void ds1307_wdt_register(struct ds1307 *ds1307)
watchdog_init_timeout(wdt, 0, ds1307->dev);
watchdog_set_drvdata(wdt, ds1307);
devm_watchdog_register_device(ds1307->dev, wdt);
+
+ return 0;
}
#else
-static void ds1307_wdt_register(struct ds1307 *ds1307)
+static int ds1307_wdt_register(struct ds1307 *ds1307)
{
+ return 0;
}
#endif /* CONFIG_WATCHDOG_CORE */
@@ -1979,9 +1984,9 @@ static int ds1307_probe(struct i2c_client *client,
ds1307_hwmon_register(ds1307);
ds1307_clks_register(ds1307);
- ds1307_wdt_register(ds1307);
+ err = ds1307_wdt_register(ds1307);
- return 0;
+ return err;
exit:
return err;
--
2.25.1
IMHO, one "return err;" is sufficient.
re,
wh
next prev parent reply other threads:[~2020-04-02 13:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-02 13:14 [PATCH][next] rtc: ds1307: check for failed memory allocation on wdt Colin King
2020-04-02 13:40 ` Walter Harms [this message]
2020-04-02 13:52 ` Alexandre Belloni
2020-04-03 8:40 ` Dan Carpenter
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=54a09b5502ee45e9a926a025ae576498@bfs.de \
--to=wharms@bfs.de \
--cc=a.zummo@towertech.it \
--cc=alexandre.belloni@bootlin.com \
--cc=chris.packham@alliedtelesis.co.nz \
--cc=colin.king@canonical.com \
--cc=kernel-janitors@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-rtc@vger.kernel.org \
--cc=linux@roeck-us.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).