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UBI: improve mkvol request validation

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Check that volume name is not shorter than 'name_len'.

No need to copy the trailing zero byte because whole array
was zeroed earlier.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
This commit is contained in:
Artem Bityutskiy
2008-07-13 21:46:24 +03:00
parent a5bf619041
commit a6ea440769
2 changed files with 7 additions and 4 deletions
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7
drivers/mtd/ubi/cdev.c
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@ -574,6 +574,10 @@ static int verify_mkvol_req(const struct ubi_device *ubi,
goto bad;
}
n = strnlen(req->name, req->name_len + 1);
if (n != req->name_len)
goto bad;
return 0;
bad:
@ -629,12 +633,11 @@ static int ubi_cdev_ioctl(struct inode *inode, struct file *file,
break;
}
req.name[req.name_len] = '\0';
err = verify_mkvol_req(ubi, &req);
if (err)
break;
req.name[req.name_len] = '\0';
mutex_lock(&ubi->volumes_mutex);
err = ubi_create_volume(ubi, &req);
mutex_unlock(&ubi->volumes_mutex);