score: do_sigaltstack() expects a userland pointer...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 2 insertions, 5 deletions

diff --git a/arch/score/kernel/signal.c b/arch/score/kernel/signal.c
index c268bbf8b410..02353bde92d8 100644
--- a/arch/score/kernel/signal.c
+++ b/arch/score/kernel/signal.c
@@ -148,7 +148,6 @@ score_rt_sigreturn(struct pt_regs *regs)
 {
         struct rt_sigframe __user *frame;
         sigset_t set;
-        stack_t st;
         int sig;
 
         /* Always make any pending restarted system calls return -EINTR */
@@ -168,12 +167,10 @@ score_rt_sigreturn(struct pt_regs *regs)
         else if (sig)
                 force_sig(sig, current);
 
-        if (__copy_from_user(&st, &frame->rs_uc.uc_stack, sizeof(st)))
-                goto badframe;
-
         /* It is more difficult to avoid calling this function than to
            call it and ignore errors.  */
-        do_sigaltstack((stack_t __user *)&st, NULL, regs->regs[0]);
+        if (do_sigaltstack(&frame->rs_uc.uc_stack, NULL, regs->regs[0]) == -EFAULT)
+                goto badframe;
         regs->is_syscall = 0;
 
         __asm__ __volatile__(