From: Stephen Hemminger <stephen@networkplumber.org>
Date: Thu, 26 Jun 2025 13:50:17 +0000 (-0700)
Subject: bond: fix stack smash in xstats
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;p=thirdparty%2Fiproute2.git

bond: fix stack smash in xstats

Building with stack smashing detection finds an off by one
in the bond xstats attribute parsing.

$ ip link xstats type bond dev bond0
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
bond0
                    LACPDU Rx 0
                    LACPDU Tx 0
                    LACPDU Unknown type Rx 0
                    LACPDU Illegal Rx 0
                    Marker Rx 0
                    Marker Tx 0
                    Marker response Rx 0
                    Marker response Tx 0
                    Marker unknown type Rx 0
*** stack smashing detected ***: terminated

Program received signal SIGABRT, Aborted.

Reported-by: z30015464 <zhongxuan2@huawei.com>
Fixes: 440c5075d662 ("ip: bond: add xstats support")
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
---

diff --git a/ip/iplink_bond.c b/ip/iplink_bond.c
index 19af67d0..62dd907c 100644
--- a/ip/iplink_bond.c
+++ b/ip/iplink_bond.c
@@ -852,7 +852,7 @@ static void bond_print_stats_attr(struct rtattr *attr, int ifindex)
 	const char *ifname = "";
 	int rem;
 
-	parse_rtattr(bondtb, LINK_XSTATS_TYPE_MAX+1, RTA_DATA(attr),
+	parse_rtattr(bondtb, LINK_XSTATS_TYPE_MAX, RTA_DATA(attr),
 	RTA_PAYLOAD(attr));
 	if (!bondtb[LINK_XSTATS_TYPE_BOND])
 		return;