From 4ab60a0d7c92cab16f7e470f80ea039a0b174bce Mon Sep 17 00:00:00 2001 From: Artem Bityutskiy Date: Sat, 5 May 2007 14:59:23 +0300 Subject: [PATCH] UBI: do not let to read too much In case of static volumes it is prohibited to read more data then available. Signed-off-by: Artem Bityutskiy --- drivers/mtd/ubi/kapi.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c index d352c4575c3d..14c66b48798e 100644 --- a/drivers/mtd/ubi/kapi.c +++ b/drivers/mtd/ubi/kapi.c @@ -319,9 +319,14 @@ int ubi_leb_read(struct ubi_volume_desc *desc, int lnum, char *buf, int offset, offset + len > vol->usable_leb_size) return -EINVAL; - if (vol->vol_type == UBI_STATIC_VOLUME && lnum == vol->used_ebs - 1 && - offset + len > vol->last_eb_bytes) - return -EINVAL; + if (vol->vol_type == UBI_STATIC_VOLUME) { + if (vol->used_ebs == 0) + /* Empty static UBI volume */ + return 0; + if (lnum == vol->used_ebs - 1 && + offset + len > vol->last_eb_bytes) + return -EINVAL; + } if (vol->upd_marker) return -EBADF;