Commit 2ce401d5 authored by Peng Fan's avatar Peng Fan Committed by Brian Norris

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: default avatarPeng Fan <van.freenix@gmail.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 7446076e
...@@ -399,7 +399,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) ...@@ -399,7 +399,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
snprintf(gd->disk_name, sizeof(gd->disk_name), snprintf(gd->disk_name, sizeof(gd->disk_name),
"%s%d", tr->name, new->devnum); "%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 */ /* Create the request queue */
spin_lock_init(&new->queue_lock); spin_lock_init(&new->queue_lock);
......
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