ar71xx: reject TP-Link images containing a bootloader

The original TP-Link firmware images can be flashed via
the sysupgrade command, however those may contain a
bootloader. Flashing such an image via sysupgrade
bricks the board, and it can't be recovered without
a serial console.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
SVN-Revision: 33944

diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index 066bfd4149615568f0b3084caf8bb7d3231b33f5..f1d95f6f6ae6aafafb619b85be3b5a3e12dcc9ec 100755 (executable)
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -65,6 +65,10 @@ tplink_get_image_hwid() {
        get_image "$@" | dd bs=4 count=1 skip=16 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
 }
 
+tplink_get_image_boot_size() {
+       get_image "$@" | dd bs=4 count=1 skip=37 2>/dev/null | hexdump -v -n 4 -e '1/1 "%02x"'
+}
+
 platform_check_image() {
        local board=$(ar71xx_board_name)
        local magic="$(get_magic_word "$1")"
@@ -174,6 +178,14 @@ platform_check_image() {
                        return 1
                }
 
+               local boot_size
+
+               boot_size=$(tplink_get_image_boot_size "$1")
+               [ "$boot_size" != "00000000" ] && {
+                       echo "Invalid image, it contains a bootloader."
+                       return 1
+               }
+
                return 0
                ;;
        wndr3700)