[<PATCH v1> 1/4] mmc: core: Add check for NULL pointer access

["Bao D. Nguyen" <nguyenb@codeaurora.org>]

If the SD card is removed, the mmc_card pointer can be set to NULL
by the mmc_sd_remove() function. Check mmc_card pointer to avoid NULL
pointer access.

Signed-off-by: Bao D. Nguyen <nguyenb@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
---
 drivers/mmc/core/bus.c  | 5 +++++
 drivers/mmc/core/core.c | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index 74de3f2..4558f51 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -131,6 +131,11 @@ static void mmc_bus_shutdown(struct device *dev)
 	struct mmc_host *host = card->host;
 	int ret;
 
+	if (!card) {
+		dev_dbg(dev, "%s: %s: card is NULL\n", dev_name(dev), __func__);
+		return;
+	}
+
 	if (dev->driver && drv->shutdown)
 		drv->shutdown(card);
 
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 6b38c19..94441a0 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -666,6 +666,9 @@ void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 {
 	unsigned int mult;
 
+	if (!card)
+		return;
+
 	/*
 	 * SDIO cards only define an upper 1 s limit on access.
 	 */
-- 
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