mtd: blktrans: fix multiplication overflow

In drivers/mtd/mtd_blkdevs.c:
406	set_capacity(gd, (new->size * tr->blksize) >> 9);
The type of new->size is unsigned long and the type of tr->blksize is int,
the result of 'new->size * tr->blksize' may exceed ULONG_MAX on 32bit
machines.

I use nand chip MT29F32G08CBADBWP which is 4GB and the parameters passed
to kernel is 'mtdparts=gpmi-nand:-(user)', the whole nand chip will be
treated as a 4GB mtd partition. new->size is 0x800000 and tr->blksize is
0x200, 'new->size * tr->blksize' however is 0. This is what we do not want
to see.

Using type cast u64 to fix the multiplication overflow issue.

Signed-off-by: Peng Fan <van.freenix@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 44dc965a2f7c0d10d2f55245568274a59db0a1ff..cb47d79f4c2153092d712b82a03496bec601a17e 100644 (file)
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -399,7 +399,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
                snprintf(gd->disk_name, sizeof(gd->disk_name),
                         "%s%d", tr->name, new->devnum);
 
-       set_capacity(gd, (new->size * tr->blksize) >> 9);
+       set_capacity(gd, ((u64)new->size * tr->blksize) >> 9);
 
        /* Create the request queue */
        spin_lock_init(&new->queue_lock);