linux-kernel - [PATCH] mmc: core: Fix size overflow for mmc partitions

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Message-Id: <20191031011132.5947-1-bradleybolen@gmail.com>
Date:   Wed, 30 Oct 2019 21:11:32 -0400
From:   Bradley Bolen <bradleybolen@...il.com>
To:     linux-mmc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, ulf.hansson@...aro.org,
        kstewart@...uxfoundation.org, tglx@...utronix.de, info@...ux.net,
        hongjiefang@...micro.com, avri.altman@....com,
        wsa+renesas@...g-engineering.com, yinbo.zhu@....com,
        Bradley Bolen <bradleybolen@...il.com>
Subject: [PATCH] mmc: core: Fix size overflow for mmc partitions

With large eMMC cards, it is possible to create general purpose
partitions that are bigger than 4GB.  The size member of the mmc_part
struct is only an unsigned int which overflows for gp partitions larger
than 4GB.  Change this to a u64 to handle the overflow.

Signed-off-by: Bradley Bolen <bradleybolen@...il.com>
---
 drivers/mmc/core/mmc.c   | 4 ++--
 include/linux/mmc/card.h | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index c8804895595f..4e89cf6524a1 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -297,7 +297,7 @@ static void mmc_manage_enhanced_area(struct mmc_card *card, u8 *ext_csd)
 	}
 }
 
-static void mmc_part_add(struct mmc_card *card, unsigned int size,
+static void mmc_part_add(struct mmc_card *card, u64 size,
 			 unsigned int part_cfg, char *name, int idx, bool ro,
 			 int area_type)
 {
@@ -345,7 +345,7 @@ static void mmc_manage_gp_partitions(struct mmc_card *card, u8 *ext_csd)
 				ext_csd[EXT_CSD_GP_SIZE_MULT + idx * 3];
 			part_size *= (size_t)(hc_erase_grp_sz *
 				hc_wp_grp_sz);
-			mmc_part_add(card, part_size << 19,
+			mmc_part_add(card, (u64)part_size << 19,
 				EXT_CSD_PART_CONFIG_ACC_GP0 + idx,
 				"gp%d", idx, false,
 				MMC_BLK_DATA_AREA_GP);
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 9b6336ad3266..b59d35bb50ba 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -226,7 +226,7 @@ struct mmc_queue_req;
  * MMC Physical partitions
  */
 struct mmc_part {
-	unsigned int	size;	/* partition size (in bytes) */
+	u64		size;	/* partition size (in bytes) */
 	unsigned int	part_cfg;	/* partition type */
 	char	name[MAX_MMC_PART_NAME_LEN];
 	bool	force_ro;	/* to make boot parts RO by default */
-- 
2.17.1