Fix debug pool grow object to properly support delta=0

(It prints garbage for some reports)

1 files changed, 9 insertions, 4 deletions

diff --git a/libdm/mm/pool-debug.c b/libdm/mm/pool-debug.c
index 911f8e2b..1c3d999b 100644
--- a/libdm/mm/pool-debug.c
+++ b/libdm/mm/pool-debug.c
@@ -218,14 +218,19 @@ int dm_pool_begin_object(struct dm_pool *p, size_t init_size)
 int dm_pool_grow_object(struct dm_pool *p, const void *extra, size_t delta)
 {
 	struct block *new;
-	size_t size = delta ? : strlen(extra);
+	size_t new_size;
+
+	if (!delta)
+		delta = strlen(extra);
 
 	assert(p->begun);
 
 	if (p->object)
-		size += p->object->size;
+		new_size = delta + p->object->size;
+	else
+		new_size = delta;
 
-	if (!(new = _new_block(size, DEFAULT_ALIGNMENT))) {
+	if (!(new = _new_block(new_size, DEFAULT_ALIGNMENT))) {
 		log_err("Couldn't extend object.");
 		return 0;
 	}
@@ -237,7 +242,7 @@ int dm_pool_grow_object(struct dm_pool *p, const void *extra, size_t delta)
 	}
 	p->object = new;
 
-	memcpy(new->data + size - delta, extra, delta);
+	memcpy(new->data + new_size - delta, extra, delta);
 
 	return 1;
 }