* [PATCH AUTOSEL 4.4 03/23] arc: kernel: Return -EFAULT if copy_to_user() fails
[not found] <20210412162736.316026-1-sashal@kernel.org>
@ 2021-04-12 16:27 ` Sasha Levin
0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-04-12 16:27 UTC (permalink / raw)
To: linux-kernel, stable; +Cc: Wang Qing, Vineet Gupta, Sasha Levin, linux-snps-arc
From: Wang Qing <wangqing@vivo.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@vivo.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 257b8699efde..639f39f39917 100644
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -97,7 +97,7 @@ 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)
@@ -111,7 +111,7 @@ 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
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