From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Thu, 13 Apr 2017 19:47:48 +0000 (+0300)
Subject: mmc: cavium: Fix a shift wrapping bug
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3fcc78340f3a9bef2be7ad54258b06e1f177d3fd;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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>
---

diff --git a/drivers/mmc/host/cavium.c b/drivers/mmc/host/cavium.c
index d89c2ebcad90..d89c011bbea8 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;