linux-kernel - [PATCH AUTOSEL 4.19 05/28] arc: kernel: Return -EFAULT if copy_to

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Message-Id: <20210412162553.315227-5-sashal@kernel.org>
Date:   Mon, 12 Apr 2021 12:25:30 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wang Qing <wangqing@...o.com>, Vineet Gupta <vgupta@...opsys.com>,
        Sasha Levin <sashal@...nel.org>,
        linux-snps-arc@...ts.infradead.org
Subject: [PATCH AUTOSEL 4.19 05/28] arc: kernel: Return -EFAULT if copy_to_user() fails

From: Wang Qing <wangqing@...o.com>

[ Upstream commit 46e152186cd89d940b26726fff11eb3f4935b45a ]

The copy_to_user() function returns the number of bytes remaining to be
copied, but we want to return -EFAULT if the copy doesn't complete.

Signed-off-by: Wang Qing <wangqing@...o.com>
Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arc/kernel/signal.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 48685445002e..da243420bcb5 100644
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -99,7 +99,7 @@ stash_usr_regs(struct rt_sigframe __user *sf, struct pt_regs *regs,
 			     sizeof(sf->uc.uc_mcontext.regs.scratch));
 	err |= __copy_to_user(&sf->uc.uc_sigmask, set, sizeof(sigset_t));
 
-	return err;
+	return err ? -EFAULT : 0;
 }
 
 static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
@@ -113,7 +113,7 @@ static int restore_usr_regs(struct pt_regs *regs, struct rt_sigframe __user *sf)
 				&(sf->uc.uc_mcontext.regs.scratch),
 				sizeof(sf->uc.uc_mcontext.regs.scratch));
 	if (err)
-		return err;
+		return -EFAULT;
 
 	set_current_blocked(&set);
 	regs->bta	= uregs.scratch.bta;
-- 
2.30.2