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rtc: ds1307: check for failed memory allocation on wdt

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Currently a failed memory allocation will lead to a null pointer
dereference on point wdt.  Fix this by checking for a failed
allocation and just returning.

Addresses-Coverity: ("Dereference null return")
Fixes: fd90d48db0 ("rtc: ds1307: add support for watchdog timer on ds1388")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200403110437.57420-1-colin.king@canonical.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Colin Ian King 2020-04-03 12:04:37 +01:00 committed by Alexandre Belloni
parent 3edf29d9d5
commit 1821b79d6a
1 changed files with 2 additions and 0 deletions
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drivers/rtc/rtc-ds1307.c
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@ -1673,6 +1673,8 @@ static void ds1307_wdt_register(struct ds1307 *ds1307)
return;
wdt = devm_kzalloc(ds1307->dev, sizeof(*wdt), GFP_KERNEL);
if (!wdt)
return;
wdt->info = &ds1388_wdt_info;
wdt->ops = &ds1388_wdt_ops;