linux-kernel - [tip:x86/urgent] x86, tls: Off by one limit check

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Message-ID: <tip-8f0750f19789cf352d7e24a6cc50f2ab1b4f1372@git.kernel.org>
Date:	Wed, 28 Mar 2012 09:46:48 -0700
From:	tip-bot for Dan Carpenter <dan.carpenter@...cle.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	stable@...r.kernel.org, tglx@...utronix.de,
	dan.carpenter@...cle.com
Subject: [tip:x86/urgent] x86, tls: Off by one limit check

Commit-ID:  8f0750f19789cf352d7e24a6cc50f2ab1b4f1372
Gitweb:     http://git.kernel.org/tip/8f0750f19789cf352d7e24a6cc50f2ab1b4f1372
Author:     Dan Carpenter <dan.carpenter@...cle.com>
AuthorDate: Sat, 24 Mar 2012 10:52:50 +0300
Committer:  H. Peter Anvin <hpa@...or.com>
CommitDate: Wed, 28 Mar 2012 09:39:35 -0700

x86, tls: Off by one limit check

These are used as offsets into an array of GDT_ENTRY_TLS_ENTRIES members
so GDT_ENTRY_TLS_ENTRIES is one past the end of the array.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: http://lkml.kernel.org/r/20120324075250.GA28258@elgon.mountain
Cc: <stable@...r.kernel.org>
Signed-off-by: H. Peter Anvin <hpa@...or.com>
---
 arch/x86/kernel/tls.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/tls.c b/arch/x86/kernel/tls.c
index 6bb7b85..bcfec2d 100644
--- a/arch/x86/kernel/tls.c
+++ b/arch/x86/kernel/tls.c
@@ -163,7 +163,7 @@ int regset_tls_get(struct task_struct *target, const struct user_regset *regset,
 {
 	const struct desc_struct *tls;
 
-	if (pos > GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
+	if (pos >= GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
 	    (pos % sizeof(struct user_desc)) != 0 ||
 	    (count % sizeof(struct user_desc)) != 0)
 		return -EINVAL;
@@ -198,7 +198,7 @@ int regset_tls_set(struct task_struct *target, const struct user_regset *regset,
 	struct user_desc infobuf[GDT_ENTRY_TLS_ENTRIES];
 	const struct user_desc *info;
 
-	if (pos > GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
+	if (pos >= GDT_ENTRY_TLS_ENTRIES * sizeof(struct user_desc) ||
 	    (pos % sizeof(struct user_desc)) != 0 ||
 	    (count % sizeof(struct user_desc)) != 0)
 		return -EINVAL;
--
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