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plugins: netlink: stricter interface name validation

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Coverity suggests validating against only a set of known characters.
However, the kernel allows just about all characters in an interface
name.  This version of valdiate_ifname() is blatantly stolen, more
or less, from linux/net/core/dev.c

 https://code.woboq.org/linux/linux/net/core/dev.c.html#1020

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
This commit is contained in:
Joachim Wiberg
2021-04-29 17:19:19 +02:00
parent 9e85c4f3d1
commit 3872077ff1
1 changed files with 3 additions and 3 deletions
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plugins/netlink.c
+3 -3
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@@ -117,14 +117,14 @@ static int validate_ifname(const char *ifname)
if (!ifname || !ifname[0])
return 1;
if (strlen(ifname) >= IFNAMSIZ)
if (strnlen(ifname, IFNAMSIZ) == IFNAMSIZ)
return 1;
if (strstr(ifname, ".."))
if (!strcmp(ifname, ".") || !strcmp(ifname, ".."))
return 1;
while (*ifname) {
if (*ifname == '/' || isspace(*ifname))
if (*ifname == '/' || *ifname == ':' || isspace(*ifname))
return 1;
ifname++;
}