From: Szabolcs Nagy <nsz@port70.net>
To: musl@lists.openwall.com
Subject: [PATCH] fix malloc_usable_size for NULL input
Date: Sun, 31 Jan 2016 17:31:03 +0100 [thread overview]
Message-ID: <20160131163102.GX9621@port70.net> (raw)
the linux man page specifies malloc_usable_size(0) to return 0 and
this is the semantics other implementations follow (jemalloc).
reported by Alexander Monakov.
---
src/malloc/malloc_usable_size.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/malloc/malloc_usable_size.c b/src/malloc/malloc_usable_size.c
index 8cccd9d..6743ea7 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;
}
--
2.7.0
reply other threads:[~2016-01-31 16:31 UTC|newest]
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