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[MTD][MTDPART] Fix a division by zero bug 

When detecting a partition beyond the end of the device, skip most of
the initialisation, in particular those bits causing a division by zero.

Signed-off-by: Jörn Engel <joern@logfs.org>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Atsushi Nemoto 2008-07-19 01:01:22 +09:00 committed by David Woodhouse
parent 6910c13681
commit f636ffb420
1 changed files with 3 additions and 1 deletions
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4
drivers/mtd/mtdpart.c
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@ -411,11 +411,12 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
/* let's do some sanity checks */
if (slave->offset >= master->size) {
/* let's register it anyway to preserve ordering */
/* let's register it anyway to preserve ordering */
slave->offset = 0;
slave->mtd.size = 0;
printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
part->name);
goto out_register;
}
if (slave->offset + slave->mtd.size > master->size) {
slave->mtd.size = master->size - slave->offset;
@ -475,6 +476,7 @@ static struct mtd_part *add_one_partition(struct mtd_info *master,
}
}
out_register:
if (part->mtdp) {
/* store the object pointer (caller may or may not register it*/
*part->mtdp = &slave->mtd;