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netfilter: ipset: replace a strncpy() with strscpy()

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To make overflows as obvious as possible and to prevent code from blithely
proceeding with a truncated string. This also has a side-effect to fix a
compilation warning when using GCC 8.2.1.

net/netfilter/ipset/ip_set_core.c: In function 'ip_set_sockfn_get':
net/netfilter/ipset/ip_set_core.c:2027:3: warning: 'strncpy' writing 32 bytes into a region of size 2 overflows the destination [-Wstringop-overflow=]

Signed-off-by: Qian Cai <cai@gmx.us>
Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Qian Cai 2018-12-10 14:39:38 +01:00 committed by Pablo Neira Ayuso
parent 8e350ce1f7
commit 00ec3ab060
1 changed files with 4 additions and 2 deletions
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6
net/netfilter/ipset/ip_set_core.c
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@ -2154,9 +2154,11 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
}
nfnl_lock(NFNL_SUBSYS_IPSET);
set = ip_set(inst, req_get->set.index);
strncpy(req_get->set.name, set ? set->name : "",
IPSET_MAXNAMELEN);
ret = strscpy(req_get->set.name, set ? set->name : "",
IPSET_MAXNAMELEN);
nfnl_unlock(NFNL_SUBSYS_IPSET);
if (ret < 0)
goto done;
goto copy;
}
default: