From 4ab60a0d7c92cab16f7e470f80ea039a0b174bce Mon Sep 17 00:00:00 2001
From: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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 <Artem.Bityutskiy@nokia.com>
---
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 d352c4575c3da..14c66b48798e2 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;
--
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