From 80bc871bdd4a8254ce19a65a54c8c918dd3ddd11 Mon Sep 17 00:00:00 2001
From: Konstantin Belousov <kib@FreeBSD.org>
Date: Sat, 12 Sep 2009 18:16:46 +0000
Subject: MFC r196861: Handle zero size for posix_memalign. Return NULL or
 unique address according to the 'V' option.

Approved by:	re (kensmith)
---
 lib/libc/stdlib/malloc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'lib/libc/stdlib/malloc.c')

diff --git a/lib/libc/stdlib/malloc.c b/lib/libc/stdlib/malloc.c
index e60746a778e6..8b13d1218d96 100644
--- a/lib/libc/stdlib/malloc.c
+++ b/lib/libc/stdlib/malloc.c
@@ -5320,6 +5320,15 @@ posix_memalign(void **memptr, size_t alignment, size_t size)
 			goto RETURN;
 		}
 
+		if (size == 0) {
+			if (opt_sysv == false)
+				size = 1;
+			else {
+				result = NULL;
+				ret = 0;
+				goto RETURN;
+			}
+		}
 		result = ipalloc(alignment, size);
 	}
 
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