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-rw-r--r--src/malloc/malloc_usable_size.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/malloc/malloc_usable_size.c b/src/malloc/malloc_usable_size.c
index 8cccd9d8..6743ea77 100644
--- a/src/malloc/malloc_usable_size.c
+++ b/src/malloc/malloc_usable_size.c
@@ -13,5 +13,5 @@ struct chunk {
size_t malloc_usable_size(void *p)
{
- return CHUNK_SIZE(MEM_TO_CHUNK(p)) - OVERHEAD;
+ return p ? CHUNK_SIZE(MEM_TO_CHUNK(p)) - OVERHEAD : 0;
}