[PATCH] arc: kernel: Return -EFAULT if copy_to_user() fails

[Wang Qing]

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 <wangq...@vivo.com>
---
 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 a78d8f7..fdbe06c
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -96,7 +96,7 @@ 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)
@@ -110,7 +110,7 @@ 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;
-- 
2.7.4