mtd: mtdswap: fix integer overflow

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=8c3f3f1d7941bcb25590b784f84accd7dcb44ba3
Commit:     8c3f3f1d7941bcb25590b784f84accd7dcb44ba3
Parent:     5e47212831ac565993d21ebd36216d98f2b58f30
Author:     Brian Norris <computersforpeace at gmail.com>
AuthorDate: Mon Jul 21 19:07:02 2014 -0700
Committer:  Brian Norris <computersforpeace at gmail.com>
CommitDate: Tue Aug 19 11:53:08 2014 -0700

    mtd: mtdswap: fix integer overflow
    
    Caught by Coverity.
    
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
---
 drivers/mtd/mtdswap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/mtdswap.c b/drivers/mtd/mtdswap.c
index 0ec96cd..48cf6f9 100644
--- a/drivers/mtd/mtdswap.c
+++ b/drivers/mtd/mtdswap.c
@@ -1474,7 +1474,7 @@ static void mtdswap_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 	}
 
 	eblocks = mtd_div_by_eb(use_size, mtd);
-	use_size = eblocks * mtd->erasesize;
+	use_size = (uint64_t)eblocks * mtd->erasesize;
 	bad_blocks = mtdswap_badblocks(mtd, use_size);
 	eavailable = eblocks - bad_blocks;