MIPS: signal: Return immediately if call fails

When debug sigaltstack(), copy_siginfo_to_user() fails first in
setup_rt_frame() if the alternate signal stack is too small, so
it should return immediately if call fails, no need to call the
following functions.

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

diff --git a/arch/mips/kernel/signal.c b/arch/mips/kernel/signal.c
index c1632e8..5bce782 100644 (file)
--- a/arch/mips/kernel/signal.c
+++ b/arch/mips/kernel/signal.c
@@ -754,23 +754,25 @@ static int setup_rt_frame(void *sig_return, struct ksignal *ksig,
                          struct pt_regs *regs, sigset_t *set)
 {
        struct rt_sigframe __user *frame;
-       int err = 0;
 
        frame = get_sigframe(ksig, regs, sizeof(*frame));
        if (!access_ok(frame, sizeof (*frame)))
                return -EFAULT;
 
        /* Create siginfo.  */
-       err |= copy_siginfo_to_user(&frame->rs_info, &ksig->info);
+       if (copy_siginfo_to_user(&frame->rs_info, &ksig->info))
+               return -EFAULT;
 
        /* Create the ucontext.  */
-       err |= __put_user(0, &frame->rs_uc.uc_flags);
-       err |= __put_user(NULL, &frame->rs_uc.uc_link);
-       err |= __save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]);
-       err |= setup_sigcontext(regs, &frame->rs_uc.uc_mcontext);
-       err |= __copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set));
-
-       if (err)
+       if (__put_user(0, &frame->rs_uc.uc_flags))
+               return -EFAULT;
+       if (__put_user(NULL, &frame->rs_uc.uc_link))
+               return -EFAULT;
+       if (__save_altstack(&frame->rs_uc.uc_stack, regs->regs[29]))
+               return -EFAULT;
+       if (setup_sigcontext(regs, &frame->rs_uc.uc_mcontext))
+               return -EFAULT;
+       if (__copy_to_user(&frame->rs_uc.uc_sigmask, set, sizeof(*set)))
                return -EFAULT;
 
        /*