From 834fdde07aa3e3bd0fa935c43bf688eb6d0850de Mon Sep 17 00:00:00 2001
From: phk <phk@FreeBSD.org>
Date: Tue, 23 Apr 2002 18:50:25 +0000
Subject: Add a basic sanity check on pointers passed to free(9).

Should be improved by:	jeff
---
 sys/kern/kern_malloc.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'sys/kern')

diff --git a/sys/kern/kern_malloc.c b/sys/kern/kern_malloc.c
index ac8ed51..e168665 100644
--- a/sys/kern/kern_malloc.c
+++ b/sys/kern/kern_malloc.c
@@ -143,6 +143,10 @@ malloc(size, type, flags)
 	uma_zone_t zone;
 	register struct malloc_type *ksp = type;
 
+#if 0
+	if (size == 0)
+		Debugger("zero size malloc");
+#endif
 #if defined(INVARIANTS)
 	if (flags == M_WAITOK)
 		KASSERT(curthread->td_intr_nesting_level == 0,
@@ -203,6 +207,12 @@ free(addr, type)
 	if (addr == NULL)
 		return;
 
+	if ((u_long)addr & 3) {	/* XXX: Jeff: find better value for 3 */
+		printf("free(9)'ing unaligned pointer %p\n", addr);
+		Debugger("Don't do that...");
+		return;
+	}
+
 	size = 0;
 
 	mem = (void *)((u_long)addr & (~UMA_SLAB_MASK));
-- 
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