signal: simplify rt_sigaction()

The goto is not needed and does not add any clarity.  Simply return
-EINVAL on unexpected sigset_t struct size directly.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Christian Brauner <[email protected]>
Acked-by: Oleg Nesterov <[email protected]>
Reviewed-by: Andrew Morton <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Morris <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephen Smalley <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

1 files changed, 10 insertions, 12 deletions

diff --git a/kernel/signal.c b/kernel/signal.c
index 10918c7b2ee3..adeee5095039 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -3648,25 +3648,23 @@ SYSCALL_DEFINE4(rt_sigaction, int, sig,
 		size_t, sigsetsize)
 {
 	struct k_sigaction new_sa, old_sa;
-	int ret = -EINVAL;
+	int ret;
 
 	/* XXX: Don't preclude handling different sized sigset_t's.  */
 	if (sigsetsize != sizeof(sigset_t))
-		goto out;
+		return -EINVAL;
 
-	if (act) {
-		if (copy_from_user(&new_sa.sa, act, sizeof(new_sa.sa)))
-			return -EFAULT;
-	}
+	if (act && copy_from_user(&new_sa.sa, act, sizeof(new_sa.sa)))
+		return -EFAULT;
 
 	ret = do_sigaction(sig, act ? &new_sa : NULL, oact ? &old_sa : NULL);
+	if (ret)
+		return ret;
 
-	if (!ret && oact) {
-		if (copy_to_user(oact, &old_sa.sa, sizeof(old_sa.sa)))
-			return -EFAULT;
-	}
-out:
-	return ret;
+	if (oact && copy_to_user(oact, &old_sa.sa, sizeof(old_sa.sa)))
+		return -EFAULT;
+
+	return 0;
 }
 #ifdef CONFIG_COMPAT
 COMPAT_SYSCALL_DEFINE4(rt_sigaction, int, sig,