[U-Boot] [PATCH] cmd: mdio: prevent data abort when no mdio bus is found

[Simon Goldschmidt]

Calling 'mdio read ...' currently leads to a data abort when no mdio
bus is found.

To fix this, check if 'bus' is a valid pointer before accessing it.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt at gmail.com>
---

 cmd/mdio.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cmd/mdio.c b/cmd/mdio.c
index 5e219f699d..e1f771d3ed 100644
--- a/cmd/mdio.c
+++ b/cmd/mdio.c
@@ -263,6 +263,11 @@ static int do_mdio(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 		break;
 	}
 
+	if (!bus) {
+		puts("No MDIO bus found\n");
+		return CMD_RET_FAILURE;
+	}
+
 	if (op[0] == 'l') {
 		mdio_list_devices();
 
-- 
2.20.1