From a6ea440769e11c46828cddd20f91ab57261701d5 Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Sun, 13 Jul 2008 21:46:24 +0300 Subject: UBI: improve mkvol request validation 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 --- drivers/mtd/ubi/cdev.c | 7 +++++-- drivers/mtd/ubi/vmt.c | 4 ++-- 2 files changed, 7 insertions(+), 4 deletions(-) (limited to 'drivers/mtd') diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c index 3e3449ec07f..4fb84e3e650 100644 --- a/drivers/mtd/ubi/cdev.c +++ b/drivers/mtd/ubi/cdev.c @@ -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); diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c index 367b04176e0..bfa7c5d2e06 100644 --- a/drivers/mtd/ubi/vmt.c +++ b/drivers/mtd/ubi/vmt.c @@ -275,7 +275,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) vol->data_pad = ubi->leb_size % vol->alignment; vol->vol_type = req->vol_type; vol->name_len = req->name_len; - memcpy(vol->name, req->name, vol->name_len + 1); + memcpy(vol->name, req->name, vol->name_len); vol->ubi = ubi; /* @@ -350,7 +350,7 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req) vtbl_rec.vol_type = UBI_VID_DYNAMIC; else vtbl_rec.vol_type = UBI_VID_STATIC; - memcpy(vtbl_rec.name, vol->name, vol->name_len + 1); + memcpy(vtbl_rec.name, vol->name, vol->name_len); err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec); if (err) -- cgit v1.2.3