From fa8d7adf33986302100313a791418423a7d4c758 Mon Sep 17 00:00:00 2001
From: Megan Wachs <megan@sifive.com>
Date: Fri, 5 May 2017 09:37:26 -0700
Subject: [PATCH]  Avoid accessing null target->reg_cache

GDB might request registers even if target was not successfully initialized.
---
 src/target/riscv/riscv.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/target/riscv/riscv.c b/src/target/riscv/riscv.c
index 42c2f8721..d754cd67d 100644
--- a/src/target/riscv/riscv.c
+++ b/src/target/riscv/riscv.c
@@ -414,6 +414,12 @@ static int riscv_get_gdb_reg_list(struct target *target,
 	if (!*reg_list) {
 		return ERROR_FAIL;
 	}
+	
+	if (!target->reg_cache) {
+		LOG_ERROR("Target not initialized. Return ERROR_FAIL.");
+		return ERROR_FAIL;
+	}
+	
 	for (int i = 0; i < *reg_list_size; i++) {
 		assert(target->reg_cache->reg_list[i].size > 0);
 		(*reg_list)[i] = &target->reg_cache->reg_list[i];