linux-kernel - [PATCH 35/38] ptrace: remove invalid check

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Date:	Mon, 21 Sep 2015 15:34:07 +0200
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrzej Hajda <a.hajda@...sung.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Eric Paris <eparis@...hat.com>, linux-sh@...r.kernel.org
Subject: [PATCH 35/38] ptrace: remove invalid check

Unsigned values cannot be lesser than zero.

The problem has been detected using proposed semantic patch
scripts/coccinelle/tests/unsigned_lesser_than_zero.cocci [1].

[1]: http://permalink.gmane.org/gmane.linux.kernel/2038576

Signed-off-by: Andrzej Hajda <a.hajda@...sung.com>
---
 arch/sh/kernel/ptrace_64.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sh/kernel/ptrace_64.c b/arch/sh/kernel/ptrace_64.c
index 5cea973..138b2b1 100644
--- a/arch/sh/kernel/ptrace_64.c
+++ b/arch/sh/kernel/ptrace_64.c
@@ -395,7 +395,7 @@ long arch_ptrace(struct task_struct *child, long request,
 		unsigned long tmp;
 
 		ret = -EIO;
-		if ((addr & 3) || addr < 0)
+		if (addr & 3)
 			break;
 
 		if (addr < sizeof(struct pt_regs))
@@ -423,7 +423,7 @@ long arch_ptrace(struct task_struct *child, long request,
                    this could crash the kernel or result in a security
                    loophole. */
 		ret = -EIO;
-		if ((addr & 3) || addr < 0)
+		if (addr & 3)
 			break;
 
 		if (addr < sizeof(struct pt_regs)) {
-- 
1.9.1

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