commit 3fcc78340f3a9bef2be7ad54258b06e1f177d3fd
author Dan Carpenter <dan.carpenter@oracle.com> Thu Apr 13 22:47:48 2017 +0300
committer Ulf Hansson <ulf.hansson@linaro.org> Mon Apr 24 21:42:23 2017 +0200
tree 5b673462b84d01516da8e17847c851b6a0e91ccf
parent fe79018aa4c3af7d74e48b9a9b117da9fb6cf353

mmc: cavium: Fix a shift wrapping bug

"dat" is a u64 and "shift" starts as 54 so this is a shift wrapping bug.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/cavium.c

diff --git a/drivers/mmc/host/cavium.c b/drivers/mmc/host/cavium.c
index d89c2eb..d89c011 100644
--- a/drivers/mmc/host/cavium.c
+++ b/drivers/mmc/host/cavium.c
@@ -733,7 +733,7 @@ static void do_write_request(struct cvm_mmc_host *host, struct mmc_request *mrq)
 		}
 
 		while (smi->consumed < smi->length && shift >= 0) {
-			dat |= ((u8 *)smi->addr)[smi->consumed] << shift;
+			dat |= (u64)((u8 *)smi->addr)[smi->consumed] << shift;
 			bytes_xfered++;
 			smi->consumed++;
 			shift -= 8;