mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 04:34:11 +08:00
f63ce5b6fa
In tun_dst_unclone() the return value of skb_metadata_dst() is checked
for being NULL after it is dereferenced. Fix this by moving the
dereference after the NULL check.
Found by the Coverity scanner (CID 1338068).
Fixes: fc4099f172 ("openvswitch: Fix egress tunnel info.")
Cc: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
142 lines
3.1 KiB
C
142 lines
3.1 KiB
C
#ifndef __NET_DST_METADATA_H
|
|
#define __NET_DST_METADATA_H 1
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <net/ip_tunnels.h>
|
|
#include <net/dst.h>
|
|
|
|
struct metadata_dst {
|
|
struct dst_entry dst;
|
|
union {
|
|
struct ip_tunnel_info tun_info;
|
|
} u;
|
|
};
|
|
|
|
static inline struct metadata_dst *skb_metadata_dst(struct sk_buff *skb)
|
|
{
|
|
struct metadata_dst *md_dst = (struct metadata_dst *) skb_dst(skb);
|
|
|
|
if (md_dst && md_dst->dst.flags & DST_METADATA)
|
|
return md_dst;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
|
|
{
|
|
struct metadata_dst *md_dst = skb_metadata_dst(skb);
|
|
struct dst_entry *dst;
|
|
|
|
if (md_dst)
|
|
return &md_dst->u.tun_info;
|
|
|
|
dst = skb_dst(skb);
|
|
if (dst && dst->lwtstate)
|
|
return lwt_tun_info(dst->lwtstate);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline bool skb_valid_dst(const struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
|
|
return dst && !(dst->flags & DST_METADATA);
|
|
}
|
|
|
|
struct metadata_dst *metadata_dst_alloc(u8 optslen, gfp_t flags);
|
|
struct metadata_dst __percpu *metadata_dst_alloc_percpu(u8 optslen, gfp_t flags);
|
|
|
|
static inline struct metadata_dst *tun_rx_dst(int md_size)
|
|
{
|
|
struct metadata_dst *tun_dst;
|
|
|
|
tun_dst = metadata_dst_alloc(md_size, GFP_ATOMIC);
|
|
if (!tun_dst)
|
|
return NULL;
|
|
|
|
tun_dst->u.tun_info.options_len = 0;
|
|
tun_dst->u.tun_info.mode = 0;
|
|
return tun_dst;
|
|
}
|
|
|
|
static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
|
|
{
|
|
struct metadata_dst *md_dst = skb_metadata_dst(skb);
|
|
int md_size;
|
|
struct metadata_dst *new_md;
|
|
|
|
if (!md_dst)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
md_size = md_dst->u.tun_info.options_len;
|
|
new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
|
|
if (!new_md)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
memcpy(&new_md->u.tun_info, &md_dst->u.tun_info,
|
|
sizeof(struct ip_tunnel_info) + md_size);
|
|
skb_dst_drop(skb);
|
|
dst_hold(&new_md->dst);
|
|
skb_dst_set(skb, &new_md->dst);
|
|
return new_md;
|
|
}
|
|
|
|
static inline struct ip_tunnel_info *skb_tunnel_info_unclone(struct sk_buff *skb)
|
|
{
|
|
struct metadata_dst *dst;
|
|
|
|
dst = tun_dst_unclone(skb);
|
|
if (IS_ERR(dst))
|
|
return NULL;
|
|
|
|
return &dst->u.tun_info;
|
|
}
|
|
|
|
static inline struct metadata_dst *ip_tun_rx_dst(struct sk_buff *skb,
|
|
__be16 flags,
|
|
__be64 tunnel_id,
|
|
int md_size)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
struct metadata_dst *tun_dst;
|
|
|
|
tun_dst = tun_rx_dst(md_size);
|
|
if (!tun_dst)
|
|
return NULL;
|
|
|
|
ip_tunnel_key_init(&tun_dst->u.tun_info.key,
|
|
iph->saddr, iph->daddr, iph->tos, iph->ttl,
|
|
0, 0, tunnel_id, flags);
|
|
return tun_dst;
|
|
}
|
|
|
|
static inline struct metadata_dst *ipv6_tun_rx_dst(struct sk_buff *skb,
|
|
__be16 flags,
|
|
__be64 tunnel_id,
|
|
int md_size)
|
|
{
|
|
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
|
|
struct metadata_dst *tun_dst;
|
|
struct ip_tunnel_info *info;
|
|
|
|
tun_dst = tun_rx_dst(md_size);
|
|
if (!tun_dst)
|
|
return NULL;
|
|
|
|
info = &tun_dst->u.tun_info;
|
|
info->mode = IP_TUNNEL_INFO_IPV6;
|
|
info->key.tun_flags = flags;
|
|
info->key.tun_id = tunnel_id;
|
|
info->key.tp_src = 0;
|
|
info->key.tp_dst = 0;
|
|
|
|
info->key.u.ipv6.src = ip6h->saddr;
|
|
info->key.u.ipv6.dst = ip6h->daddr;
|
|
info->key.tos = ipv6_get_dsfield(ip6h);
|
|
info->key.ttl = ip6h->hop_limit;
|
|
return tun_dst;
|
|
}
|
|
|
|
#endif /* __NET_DST_METADATA_H */
|