diff --git a/components/drivers/sdio/block_dev.c b/components/drivers/sdio/block_dev.c
index 6a55e85a3d..cc4e24e3c8 100644
--- a/components/drivers/sdio/block_dev.c
+++ b/components/drivers/sdio/block_dev.c
@@ -252,7 +252,7 @@ static rt_size_t rt_mmcsd_read(rt_device_t dev,
                                void       *buffer,
                                rt_size_t   size)
 {
-    rt_err_t err;
+    rt_err_t err = 0;
     rt_size_t offset = 0;
     rt_size_t req_size = 0;
     rt_size_t remain_size = size;
@@ -293,7 +293,7 @@ static rt_size_t rt_mmcsd_write(rt_device_t dev,
                                 const void *buffer,
                                 rt_size_t   size)
 {
-    rt_err_t err;
+    rt_err_t err = 0;
     rt_size_t offset = 0;
     rt_size_t req_size = 0;
     rt_size_t remain_size = size;
diff --git a/components/drivers/sdio/mmc.c b/components/drivers/sdio/mmc.c
index e617c115f4..efda67c087 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(card == RT_NULL || ext_csd == RT_NULL)
+  {
+    LOG_E("emmc parse ext csd fail, invaild args");
+    return -1;
+  }
+
   card->flags |=  CARD_FLAG_HIGHSPEED;
   card->hs_max_data_rate = 200000000;
   
@@ -424,7 +430,7 @@ static rt_int32_t mmcsd_mmc_init_card(struct rt_mmcsd_host *host,
 {
     rt_int32_t err;
     rt_uint32_t resp[4];
-    rt_uint32_t rocr;
+    rt_uint32_t rocr = 0;
     rt_uint32_t max_data_rate;
     rt_uint8_t *ext_csd = RT_NULL;
     struct rt_mmcsd_card *card = RT_NULL;
diff --git a/components/drivers/sdio/sdio.c b/components/drivers/sdio/sdio.c
index 67e82156b3..7b38c39570 100644
--- a/components/drivers/sdio/sdio.c
+++ b/components/drivers/sdio/sdio.c
@@ -140,6 +140,7 @@ rt_int32_t sdio_io_rw_direct(struct rt_mmcsd_card *card,
 
     RT_ASSERT(card != RT_NULL);
     RT_ASSERT(fn <= SDIO_MAX_FUNCTIONS);
+    RT_ASSERT(pdata != RT_NULL);
 
     if (reg_addr & ~SDIO_ARG_CMD53_REG_MASK)
         return -RT_ERROR;
@@ -937,6 +938,7 @@ err3:
                 host->card->sdio_function[i] = RT_NULL;
                 rt_free(host->card);
                 host->card = RT_NULL;
+                break;
             }
         }
     }