setup: if all BootXXXX are used, find the next slot behind, don't overwrite Boot0000

https://bbs.archlinux.org/viewtopic.php?pid=1242470#p1242470

1 files changed, 5 insertions, 0 deletions

diff --git a/src/setup/setup.c b/src/setup/setup.c
index 962126c..c9249ee 100644
--- a/src/setup/setup.c
+++ b/src/setup/setup.c
@@ -900,6 +900,11 @@ static int find_slot(const uint8_t uuid[16], const char *path, uint16_t *id) {
                         goto finish;
                 }
 
+        /* use the next one */
+        if (i == 0xffff)
+                return -ENOSPC;
+        new_id = i;
+
 finish:
         *id = new_id;
         free(options);