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Date:      Tue, 10 Sep 2013 05:17:53 +0000 (UTC)
From:      Konstantin Belousov <kib@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r255439 - head/sys/dev/cpuctl
Message-ID:  <201309100517.r8A5HrHY020358@svn.freebsd.org>
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Author: kib
Date: Tue Sep 10 05:17:53 2013
New Revision: 255439
URL: http://svnweb.freebsd.org/changeset/base/255439

Log:
  Call free() on the pointer returned from malloc().
  
  Reported and tested by:	Oliver Pinter <oliver.pntr@gmail.com>
  Sponsored by:	The FreeBSD Foundation
  MFC after:	3 days
  Approved by:	re (delphij)

Modified:
  head/sys/dev/cpuctl/cpuctl.c

Modified: head/sys/dev/cpuctl/cpuctl.c
==============================================================================
--- head/sys/dev/cpuctl/cpuctl.c	Tue Sep 10 03:48:18 2013	(r255438)
+++ head/sys/dev/cpuctl/cpuctl.c	Tue Sep 10 05:17:53 2013	(r255439)
@@ -295,10 +295,10 @@ cpuctl_do_update(int cpu, cpuctl_update_
 static int
 update_intel(int cpu, cpuctl_update_args_t *args, struct thread *td)
 {
-	void *ptr = NULL;
+	void *ptr;
 	uint64_t rev0, rev1;
 	uint32_t tmp[4];
-	int is_bound = 0;
+	int is_bound;
 	int oldcpu;
 	int ret;
 
@@ -312,10 +312,11 @@ update_intel(int cpu, cpuctl_update_args
 	}
 
 	/*
-	 * 16 byte alignment required.
+	 * 16 byte alignment required.  Rely on the fact that
+	 * malloc(9) always returns the pointer aligned at least on
+	 * the size of the allocation.
 	 */
 	ptr = malloc(args->size + 16, M_CPUCTL, M_WAITOK);
-	ptr = (void *)(16 + ((intptr_t)ptr & ~0xf));
 	if (copyin(args->data, ptr, args->size) != 0) {
 		DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
 		    __LINE__, args->data, ptr, args->size);
@@ -408,10 +409,10 @@ fail:
 static int
 update_via(int cpu, cpuctl_update_args_t *args, struct thread *td)
 {
-	void *ptr = NULL;
+	void *ptr;
 	uint64_t rev0, rev1, res;
 	uint32_t tmp[4];
-	int is_bound = 0;
+	int is_bound;
 	int oldcpu;
 	int ret;
 
@@ -427,8 +428,7 @@ update_via(int cpu, cpuctl_update_args_t
 	/*
 	 * 4 byte alignment required.
 	 */
-	ptr = malloc(args->size + 16, M_CPUCTL, M_WAITOK);
-	ptr = (void *)(16 + ((intptr_t)ptr & ~0xf));
+	ptr = malloc(args->size, M_CPUCTL, M_WAITOK);
 	if (copyin(args->data, ptr, args->size) != 0) {
 		DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
 		    __LINE__, args->data, ptr, args->size);

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