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-rw-r--r--src/common/container.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/common/container.c b/src/common/container.c
index e1ed67856b..b138c9273c 100644
--- a/src/common/container.c
+++ b/src/common/container.c
@@ -90,6 +90,7 @@ void
smartlist_add_all(smartlist_t *s1, const smartlist_t *s2)
{
smartlist_ensure_capacity(s1, s1->num_used + s2->num_used);
+ tor_assert(s1->capacity >= s1->num_used+s2->num_used);
memcpy(s1->list + s1->num_used, s2->list, s2->num_used*sizeof(void*));
s1->num_used += s2->num_used;
}