[PATCH 1/5] mmc: omap_hsmmc: Avoid host->cmd dereference during data transfer failures

[Venkatraman S <svenkatr@ti.com>]

Sometimes, a error occurs just after the Command has been reported
to be successful (CC=1) but before data transfer completes (TC=1).
Setting end_cmd=1 here leads to a NULL pointer dereference of
host->cmd as the command complete has previously been handled.

Set end_cmd only when command complete has not been handled
before, else a NULL pointer dereference occurs.

CC: stable@vger.kernel.org
Signed-off-by: Venkatraman S <svenkatr@ti.com>
---
 drivers/mmc/host/omap_hsmmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 5434fd8..06d2e03 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -996,7 +996,8 @@ static void omap_hsmmc_do_irq(struct omap_hsmmc_host *host, int status)
 		else if (status & (CMD_CRC | DATA_CRC))
 			hsmmc_command_incomplete(host, -EILSEQ);
 
-		end_cmd = 1;
+		if (host->cmd)
+			end_cmd = 1;
 		if (host->data || host->response_busy) {
 			end_trans = 1;
 			host->response_busy = 0;
-- 
1.8.0