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serial: samsung: protect NULL dereference of clock name

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When priting the serial clock source, if clock source name is null,
kernel reference NULL point.

Signed-off-by: KeyYoung Park <keyyoung.park@samsung.com>
Signed-off-by: Huisung Kang <hs1218.kang@samsung.com>
Signed-off-by: Kyoungil Kim <ki0351.kim@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
KeyYoung Park 2012-05-30 17:29:55 +09:00 committed by Greg Kroah-Hartman
parent 25f04ad423
commit 7b15e1d9e3
1 changed files with 2 additions and 1 deletions
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3
drivers/tty/serial/samsung.c
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@ -1162,7 +1162,8 @@ static ssize_t s3c24xx_serial_show_clksrc(struct device *dev,
if (IS_ERR(ourport->baudclk))
return -EINVAL;
return snprintf(buf, PAGE_SIZE, "* %s\n", ourport->baudclk->name);
return snprintf(buf, PAGE_SIZE, "* %s\n",
ourport->baudclk->name ?: "(null)");
}
static DEVICE_ATTR(clock_source, S_IRUGO, s3c24xx_serial_show_clksrc, NULL);