netdev - [PATCH 1/1] ip: fix igmp parsing when iface is long

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Date:   Tue, 17 Jan 2017 00:25:50 +0100
From:   Petr Vorel <pvorel@...e.cz>
To:     netdev@...r.kernel.org
Cc:     Petr Vorel <pvorel@...e.cz>
Subject: [PATCH 1/1] ip: fix igmp parsing when iface is long

Entries with long vhost names in /proc/net/igmp have no whitespace
between name and colon, so sscanf() adds it to vhost and
'ip maddr show iface' doesn't include inet result.

Signed-off-by: Petr Vorel <pvorel@...e.cz>
---
 ip/ipmaddr.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/ip/ipmaddr.c b/ip/ipmaddr.c
index 22eb407..4f726fd 100644
--- a/ip/ipmaddr.c
+++ b/ip/ipmaddr.c
@@ -136,13 +136,17 @@ static void read_igmp(struct ma_info **result_p)
 
 	while (fgets(buf, sizeof(buf), fp)) {
 		struct ma_info *ma;
+		size_t len;
 
 		if (buf[0] != '\t') {
 			sscanf(buf, "%d%s", &m.index, m.name);
+			len = strlen(m.name);
+			if (m.name[len - 1] == ':')
+				len--;
 			continue;
 		}
 
-		if (filter.dev && strcmp(filter.dev, m.name))
+		if (filter.dev && strncmp(filter.dev, m.name, len))
 			continue;
 
 		sscanf(buf, "%08x%d", (__u32 *)&m.addr.data, &m.users);
-- 
2.11.0