MIPS: Don't block signals if we'd failed to setup a sigframe

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/1696/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/signal.c

@@ -575,6 +575,9 @@ static int handle_signal(unsigned long sig, siginfo_t *info,
 		ret = abi->setup_frame(vdso + abi->signal_return_offset,
 				       ka, regs, sig, oldset);
 
+	if (ret)
+		return ret;
+
 	spin_lock_irq(&current->sighand->siglock);
 	sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
 	if (!(ka->sa.sa_flags & SA_NODEFER))