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-rw-r--r--src/lib/imd.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/src/lib/imd.c b/src/lib/imd.c
index 3be38ea678..2b028a7b44 100644
--- a/src/lib/imd.c
+++ b/src/lib/imd.c
@@ -144,10 +144,11 @@ static int imdr_create_empty(struct imdr *imdr, size_t root_size,
/*
* root_size needs to be large enough to accommodate root pointer and
- * root book keeping structure. The caller needs to ensure there's
- * enough room for tracking individual allocations.
+ * root book keeping structure. Furthermore, there needs to be a space
+ * for at least one entry covering root region. The caller needs to
+ * ensure there's enough room for tracking individual allocations.
*/
- if (root_size < (sizeof(*rp) + sizeof(*r)))
+ if (root_size < (sizeof(*rp) + sizeof(*r) + sizeof(*e)))
return -1;
/* For simplicity don't allow sizes or alignments to exceed LIMIT_ALIGN.