[PATCH] test: eth: Don't crash if env_get returns NULL

[Sean Anderson]

env_get can return NULL if it fails to find the variable. Check its result
before using it.

Fixes: 6d9764c2a87 ("dm: test: Add a new test case against dm eth codes for 
NULL pointer access")
Fixes: df33fd28897 ("test: eth: Add test for ethernet addresses")
Signed-off-by: Sean Anderson <sean...@gmail.com>
---

 test/dm/eth.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/test/dm/eth.c b/test/dm/eth.c
index d05d2a9abe1..bb3dcc6b954 100644
--- a/test/dm/eth.c
+++ b/test/dm/eth.c
@@ -263,12 +263,16 @@ static int dm_test_eth_act(struct unit_test_state *uts)
 
        /* Prepare the test scenario */
        for (i = 0; i < DM_TEST_ETH_NUM; i++) {
+               char *addr;
+
                ut_assertok(uclass_find_device_by_name(UCLASS_ETH,
                                                       ethname[i], &dev[i]));
                ut_assertok(device_remove(dev[i], DM_REMOVE_NORMAL));
 
                /* Invalidate MAC address */
-               strncpy(ethaddr[i], env_get(addrname[i]), 17);
+               addr = env_get(addrname[i]);
+               ut_assertnonnull(addr);
+               strncpy(ethaddr[i], addr, 17);
                /* Must disable access protection for ethaddr before clearing */
                env_set(".flags", addrname[i]);
                env_set(addrname[i], NULL);
@@ -312,12 +316,16 @@ static int dm_test_ethaddr(struct unit_test_state *uts)
 
        for (i = 0; i < ARRAY_SIZE(addr); i++) {
                char addrname[10];
+               char *env_addr;
 
                if (i)
                        snprintf(addrname, sizeof(addrname), "eth%daddr", i + 
1);
                else
                        strcpy(addrname, "ethaddr");
-               ut_asserteq_str(addr[i], env_get(addrname));
+
+               env_addr = env_get(addrname);
+               ut_assertnonnull(env_addr);
+               ut_asserteq_str(addr[i], env_addr);
        }
 
        return 0;
-- 
2.37.1