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net: xtensa: use strscpy to copy strings

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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>
This commit is contained in:
Jason Wang 2021-12-20 16:46:02 +08:00 committed by Max Filippov
parent ffb217a13a
commit b8f9a9aa02
1 changed files with 2 additions and 2 deletions
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4
arch/xtensa/platforms/iss/network.c
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@ -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);