[PATCH] libnvdimm: Add check for nd_dax_alloc

[Jiasheng Jiang]

As the nd_dax_alloc may return NULL pointer,
it should be better to add check for the return
value, as same as the one in nd_dax_create().

Fixes: c5ed9268643c ("libnvdimm, dax: autodetect support")
Signed-off-by: Jiasheng Jiang <jiash...@iscas.ac.cn>
---
 drivers/nvdimm/dax_devs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nvdimm/dax_devs.c b/drivers/nvdimm/dax_devs.c
index 7f4a9d28b670..9efe62b95dd8 100644
--- a/drivers/nvdimm/dax_devs.c
+++ b/drivers/nvdimm/dax_devs.c
@@ -106,6 +106,8 @@ int nd_dax_probe(struct device *dev, struct 
nd_namespace_common *ndns)
 
        nvdimm_bus_lock(&ndns->dev);
        nd_dax = nd_dax_alloc(nd_region);
+       if (!nd_dax)
+               return -ENOMEM;
        nd_pfn = &nd_dax->nd_pfn;
        dax_dev = nd_pfn_devinit(nd_pfn, ndns);
        nvdimm_bus_unlock(&ndns->dev);
-- 
2.25.1