arc: kernel: Return -EFAULT if copy_to_user() fails

[ 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>

diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 257b8699efde4f7557b35d8eec2252b7db4903fd..639f39f39917341878ad75933fd76bbe4dc64c81 100644 (file)
--- 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;