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mtd: sanity check ioctl input

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If "ur_idx" is wrong we could go past the end of the array.  The
"ur_idx" comes from root so it's not a huge deal, but adding a sanity
check makes the code more robust.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Dan Carpenter 2010-09-08 21:39:56 +02:00 committed by David Woodhouse
parent 0eecf4b20d
commit 5e59be1f35
1 changed files with 3 additions and 0 deletions
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3
drivers/mtd/mtdchar.c
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@ -546,6 +546,9 @@ static int mtd_ioctl(struct file *file, u_int cmd, u_long arg)
if (get_user(ur_idx, &(ur->regionindex)))
return -EFAULT;
if (ur_idx >= mtd->numeraseregions)
return -EINVAL;
kr = &(mtd->eraseregions[ur_idx]);
if (put_user(kr->offset, &(ur->offset))