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Commit 4ab60a0d authored by Artem Bityutskiy's avatar Artem Bityutskiy
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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: default avatarArtem Bityutskiy <Artem.Bityutskiy@nokia.com>
parent 78d87c95
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+8 −3
Original line number Diff line number Diff line
@@ -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 &&
	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;