drivers/rtc/rtc-max8998.c: check for pdata presence before dereferencing

Currently the driver can crash with a NULL pointer dereference if no
pdata is provided, despite of successful registration of the MFD part.
This patch fixes the problem by adding a NULL check before dereferencing
the pdata pointer.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Sachin Kamat <sachin.kamat@linaro.org>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rtc/rtc-max8998.c b/drivers/rtc/rtc-max8998.c
index 48b6612fae7fb59b13804972e2709884f79da92a..d5af7baa48b56c893e449b418d158f7b25448628 100644 (file)
--- a/drivers/rtc/rtc-max8998.c
+++ b/drivers/rtc/rtc-max8998.c
@@ -285,7 +285,7 @@ static int max8998_rtc_probe(struct platform_device *pdev)
                        info->irq, ret);
 
        dev_info(&pdev->dev, "RTC CHIP NAME: %s\n", pdev->id_entry->name);
-       if (pdata->rtc_delay) {
+       if (pdata && pdata->rtc_delay) {
                info->lp3974_bug_workaround = true;
                dev_warn(&pdev->dev, "LP3974 with RTC REGERR option."
                                " RTC updates will be extremely slow.\n");