diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/netlink.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/net/netlink.h b/include/net/netlink.h index 1a8356ca4b78..546d10586576 100644 --- a/include/net/netlink.h +++ b/include/net/netlink.h @@ -2265,6 +2265,25 @@ static inline int nla_nest_end(struct sk_buff *skb, struct nlattr *start) } /** + * nla_nest_end_safe - Validate and finalize nesting of attributes + * @skb: socket buffer the attributes are stored in + * @start: container attribute + * + * Corrects the container attribute header to include all appended + * attributes. + * + * Returns: the total data length of the skb, or -EMSGSIZE if the + * nested attribute length exceeds U16_MAX. + */ +static inline int nla_nest_end_safe(struct sk_buff *skb, struct nlattr *start) +{ + if (skb_tail_pointer(skb) - (unsigned char *)start > U16_MAX) + return -EMSGSIZE; + + return nla_nest_end(skb, start); +} + +/** * nla_nest_cancel - Cancel nesting of attributes * @skb: socket buffer the message is stored in * @start: container attribute |