dm: eth: Correctly detect alias in eth_get_dev_by_name()

When given a device name string, we should test to see if it is
really an alias like "eth#".

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>

diff --git a/net/eth.c b/net/eth.c
index c46a8c30500130bff53f4766d15724500c94bfdb..26520d303885ea1e77e396b7f175d13f0299417b 100644 (file)
--- a/net/eth.c
+++ b/net/eth.c
@@ -195,10 +195,11 @@ struct udevice *eth_get_dev_by_name(const char *devname)
        const char *startp = NULL;
        struct udevice *it;
        struct uclass *uc;
+       int len = strlen("eth");
 
        /* Must be longer than 3 to be an alias */
-       if (strlen(devname) > strlen("eth")) {
-               startp = devname + strlen("eth");
+       if (!strncmp(devname, "eth", len) && strlen(devname) > len) {
+               startp = devname + len;
                seq = simple_strtoul(startp, &endp, 10);
        }