netconsole: add support for strings with new line in netpoll_parse_ip_addr

The current IP address parsing logic fails when the input string
contains a trailing newline character. This can occur when IP
addresses are provided through configfs, which contains newlines in
a const buffer.

Teach netpoll_parse_ip_addr() how to ignore newlines at the end of the
IPs. Also, simplify the code by:

 * No need to check for separators. Try to parse ipv4, if it fails try
   ipv6 similarly to ceph_pton()
 * If ipv6 is not supported, don't call in6_pton() at all.

Signed-off-by: Breno Leitao <leitao@debian.org>
Link: https://patch.msgid.link/20250811-netconsole_ref-v4-2-9c510d8713a2@debian.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 8d1b93264e0fdb94488acf48f0335e2870059453..2919522d963e2361432f6bf0be3799194feaa4b3 100644 (file)
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -300,23 +300,30 @@ static void netconsole_print_banner(struct netpoll *np)
        np_info(np, "remote ethernet address %pM\n", np->remote_mac);
 }
 
+/* Parse the string and populate the `inet_addr` union. Return 0 if IPv4 is
+ * populated, 1 if IPv6 is populated, and -1 upon failure.
+ */
 static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr)
 {
-       const char *end;
+       const char *end = NULL;
+       int len;
 
-       if (!strchr(str, ':') &&
-           in4_pton(str, -1, (void *)addr, -1, &end) > 0) {
-               if (!*end)
-                       return 0;
-       }
-       if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) {
-#if IS_ENABLED(CONFIG_IPV6)
-               if (!*end)
-                       return 1;
-#else
+       len = strlen(str);
+       if (!len)
                return -1;
-#endif
-       }
+
+       if (str[len - 1] == '\n')
+               len -= 1;
+
+       if (in4_pton(str, len, (void *)addr, -1, &end) > 0 &&
+           (!end || *end == 0 || *end == '\n'))
+               return 0;
+
+       if (IS_ENABLED(CONFIG_IPV6) &&
+           in6_pton(str, len, (void *)addr, -1, &end) > 0 &&
+           (!end || *end == 0 || *end == '\n'))
+               return 1;
+
        return -1;
 }