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net: ipv6: fix return value of ip6_skb_dst_mtu 

commit 40fc3054b45820c28ea3c65e2c86d041dc244a8a upstream.

Commit 628a5c5618 ("[INET]: Add IP(V6)_PMTUDISC_RPOBE") introduced
ip6_skb_dst_mtu with return value of signed int which is inconsistent
with actually returned values. Also 2 users of this function actually
assign its value to unsigned int variable and only __xfrm6_output
assigns result of this function to signed variable but actually uses
as unsigned in further comparisons and calls. Change this function
to return unsigned int value.

Fixes: 628a5c5618 ("[INET]: Add IP(V6)_PMTUDISC_RPOBE")
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Vadim Fedorenko <vfedorenko@novek.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vadim Fedorenko 2021-07-02 02:47:00 +03:00 committed by Greg Kroah-Hartman
parent 9872273b67
commit c6f4a71153
2 changed files with 2 additions and 2 deletions
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2
include/net/ip6_route.h
View File

@ -261,7 +261,7 @@ static inline bool ipv6_anycast_destination(const struct dst_entry *dst,
int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
int (*output)(struct net *, struct sock *, struct sk_buff *));
static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
static inline unsigned int ip6_skb_dst_mtu(struct sk_buff *skb)
{
int mtu;

2
net/ipv6/xfrm6_output.c
View File

@ -144,7 +144,7 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
struct xfrm_state *x = dst->xfrm;
int mtu;
unsigned int mtu;
bool toobig;
#ifdef CONFIG_NETFILTER