From 780f538525637eaed5315c66ee1c52228c16b1d6 Mon Sep 17 00:00:00 2001
From: ZYH <lymz@foxmail.com>
Date: Sat, 22 Sep 2018 15:02:48 +0800
Subject: [PATCH] [Components][SDIO][MMC] fix null point check

---
 components/drivers/sdio/mmc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/components/drivers/sdio/mmc.c b/components/drivers/sdio/mmc.c
index e617c115f4..b928119b7d 100644
--- a/components/drivers/sdio/mmc.c
+++ b/components/drivers/sdio/mmc.c
@@ -198,6 +198,12 @@ static int mmc_get_ext_csd(struct rt_mmcsd_card *card, rt_uint8_t **new_ext_csd)
  */
 static int mmc_parse_ext_csd(struct rt_mmcsd_card *card, rt_uint8_t *ext_csd)
 {
+  if(RT_NULL == card || RT_NULL == ext_csd)
+  {
+    LOG_E("emmc parse ext csd fail, invaild args");
+    return -1;
+  }
+  
   card->flags |=  CARD_FLAG_HIGHSPEED;
   card->hs_max_data_rate = 200000000;