net: xtensa: use strscpy to copy strings

The strlcpy should not be used because it doesn't limit the source
length. So that it will lead some potential bugs.

But the strscpy doesn't require reading memory from the src string
beyond the specified "count" bytes, and since the return value is
easier to error-check than strlcpy()'s. In addition, the implementation
is robust to the string changing out from underneath it, unlike the
current strlcpy() implementation.

Thus, replace strlcpy with strscpy.

Signed-off-by: Jason Wang <wangborong@cdjrlc.com>
Message-Id: <20211220084602.952091-1-wangborong@cdjrlc.com>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>

diff --git a/arch/xtensa/platforms/iss/network.c b/arch/xtensa/platforms/iss/network.c
index 962e5e14520975a1c2c608cd36ddae423a387b5a..e62e31c889566323d5534c83c5e7d162b2826525 100644 (file)
--- a/arch/xtensa/platforms/iss/network.c
+++ b/arch/xtensa/platforms/iss/network.c
@@ -174,7 +174,7 @@ static int tuntap_open(struct iss_net_private *lp)
 
        memset(&ifr, 0, sizeof(ifr));
        ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
-       strlcpy(ifr.ifr_name, dev_name, sizeof(ifr.ifr_name));
+       strscpy(ifr.ifr_name, dev_name, sizeof(ifr.ifr_name));
 
        err = simc_ioctl(fd, TUNSETIFF, &ifr);
        if (err < 0) {
@@ -249,7 +249,7 @@ static int tuntap_probe(struct iss_net_private *lp, int index, char *init)
                return 0;
        }
 
-       strlcpy(lp->tp.info.tuntap.dev_name, dev_name,
+       strscpy(lp->tp.info.tuntap.dev_name, dev_name,
                sizeof(lp->tp.info.tuntap.dev_name));
 
        setup_etheraddr(dev, mac_str);