uboot-sign: Fix potential index error issues

Someone reported that if some other shell function has left i or j set,
the concat_dtb_helper function could fail. Add a small tweak to avoid this.

[YOCTO #14815]

(From OE-Core rev: d219c97bdf5d30be89795fbf9b66ddc367bef384)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/meta/classes/uboot-sign.bbclass b/meta/classes/uboot-sign.bbclass
index 4ca8118eb2..31ffe1f472 100644
--- a/meta/classes/uboot-sign.bbclass
+++ b/meta/classes/uboot-sign.bbclass
@@ -134,6 +134,8 @@ concat_dtb_helper() {
 
                         if [ -n "${UBOOT_CONFIG}" ]
                         then
+                                i=0
+                                j=0
                                 for config in ${UBOOT_MACHINE}; do
                                         i=$(expr $i + 1);
                                         for type in ${UBOOT_CONFIG}; do