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netfilter: conntrack: comparison of unsigned in cthelper confirmation

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commit 94945ad2b330207cded0fd8d4abebde43a776dfb upstream.

net/netfilter/nf_conntrack_core.c: In function nf_confirm_cthelper:
net/netfilter/nf_conntrack_core.c:2117:15: warning: comparison of unsigned expression in < 0 is always false [-Wtype-limits]
 2117 |   if (protoff < 0 || (frag_off & htons(~0x7)) != 0)
      |               ^

ipv6_skip_exthdr() returns a signed integer.

Reported-by: Colin Ian King <colin.king@canonical.com>
Fixes: 703acd70f249 ("netfilter: nfnetlink_cthelper: unbreak userspace helper support")
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2020-05-27 12:17:34 +02:00 • committed by Greg Kroah-Hartman
commit 987de40bff
1 changed files with 1 additions and 1 deletions
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2
net/netfilter/nf_conntrack_core.c
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@ -1955,7 +1955,7 @@ static int nf_confirm_cthelper(struct sk_buff *skb, struct nf_conn *ct,
{
const struct nf_conntrack_helper *helper;
const struct nf_conn_help *help;
unsigned int protoff;
int protoff;
help = nfct_help(ct);
if (!help)