[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <87r3rnbbga.wl%kuninori.morimoto.gx@renesas.com>
Date: Tue, 14 Apr 2015 04:07:30 +0000
From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
CC: <ryusuke.sakato.bx@...esas.com>,
<yoshihiro.shimoda.uh@...esas.com>,
<hiroyuki.yokoyama.vx@...esas.com>,
<takeshi.kihara.df@...esas.com>,
Jaehoon Chung <jh80.chung@...sung.com>,
Chris Ball <chris@...ntf.net>,
Seungwon Jeon <tgih.jun@...sung.com>,
"Grégory Soutadé"
<gsoutade@...tion.com>, <linux-kernel@...r.kernel.org>,
<linux-mmc@...r.kernel.org>
Subject: [PATCH 1/2] mmc: cast u8 to unsigned long long to avoid unexpected error
From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
card->ext_csd.enhanced_area_offset is defined as "unsigned long long",
and, ext_csd[] is defined as u8.
unsigned long long data might have strange data if first bit of ext_csd[]
was 1. this patch cast it to (unsigned long long)
ex)
u8 data8;
u64 data64;
data8 = 0x80;
data64 = (data8 << 24); // 0xffffffff80000000
data64 = (((unsigned long long)data8) << 24); // 0x80000000;
Reported-by: coverity <http://www.coverity.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
---
drivers/mmc/core/mmc.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index c84131e..c6bb577 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -266,8 +266,10 @@ static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
* calculate the enhanced data area offset, in bytes
*/
card->ext_csd.enhanced_area_offset =
- (ext_csd[139] << 24) + (ext_csd[138] << 16) +
- (ext_csd[137] << 8) + ext_csd[136];
+ (((unsigned long long)ext_csd[139]) << 24) +
+ (((unsigned long long)ext_csd[138]) << 16) +
+ (((unsigned long long)ext_csd[137]) << 8) +
+ (((unsigned long long)ext_csd[136]));
if (mmc_card_blockaddr(card))
card->ext_csd.enhanced_area_offset <<= 9;
/*
--
1.9.1
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists