[PATCH] make ds1wm driver to check ds1wm_platform_data pointer against NULL

Do a sanity check for the "struct ds1wm_platform_data" pointer passed in
by the platform_device, and so to enforce each platform to provide a
valid structure.

Signed-off-by: eric miao <[email protected]>
---
 drivers/w1/masters/ds1wm.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/w1/masters/ds1wm.c b/drivers/w1/masters/ds1wm.c
index 5747997..11ce9ec 100644
--- a/drivers/w1/masters/ds1wm.c
+++ b/drivers/w1/masters/ds1wm.c
@@ -351,6 +351,10 @@ static int ds1wm_probe(struct platform_device *pdev)
 		goto err0;
 	}
 	plat = pdev->dev.platform_data;
+	if (!plat) {
+		ret = -ENXIO;
+		goto err0;
+	}
 	ds1wm_data->bus_shift = plat->bus_shift;
 	ds1wm_data->pdev = pdev;
 	ds1wm_data->pdata = plat;
-- 
1.5.2.5.GIT
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