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netlink: Add nla_memdup() to wrap kmemdup() use on nlattr

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Wrap several common instances of:
	kmemdup(nla_data(attr), nla_len(attr), GFP_KERNEL);

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2016-10-26 10:53:16 +02:00 committed by David S. Miller
parent f8da977989
commit b15ca182ed
4 changed files with 13 additions and 8 deletions
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10
include/net/netlink.h
View file

@ -1190,6 +1190,16 @@ static inline struct in6_addr nla_get_in6_addr(const struct nlattr *nla)
return tmp;
}
/**
* nla_memdup - duplicate attribute memory (kmemdup)
* @src: netlink attribute to duplicate from
* @gfp: GFP mask
*/
static inline void *nla_memdup(const struct nlattr *src, gfp_t gfp)
{
return kmemdup(nla_data(src), nla_len(src), gfp);
}
/**
* nla_nest_start - Start a new level of nested attributes
* @skb: socket buffer to add attributes to

4
net/sched/act_bpf.c
View file

@ -226,9 +226,7 @@ static int tcf_bpf_init_from_efd(struct nlattr **tb, struct tcf_bpf_cfg *cfg)
return PTR_ERR(fp);
if (tb[TCA_ACT_BPF_NAME]) {
name = kmemdup(nla_data(tb[TCA_ACT_BPF_NAME]),
nla_len(tb[TCA_ACT_BPF_NAME]),
GFP_KERNEL);
name = nla_memdup(tb[TCA_ACT_BPF_NAME], GFP_KERNEL);
if (!name) {
bpf_prog_put(fp);
return -ENOMEM;

4
net/sched/cls_bpf.c
View file

@ -369,9 +369,7 @@ static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
return PTR_ERR(fp);
if (tb[TCA_BPF_NAME]) {
name = kmemdup(nla_data(tb[TCA_BPF_NAME]),
nla_len(tb[TCA_BPF_NAME]),
GFP_KERNEL);
name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL);
if (!name) {
bpf_prog_put(fp);
return -ENOMEM;

3
net/wireless/nl80211.c
View file

@ -10625,8 +10625,7 @@ static int handle_nan_filter(struct nlattr *attr_filter,
i = 0;
nla_for_each_nested(attr, attr_filter, rem) {
filter[i].filter = kmemdup(nla_data(attr), nla_len(attr),
GFP_KERNEL);
filter[i].filter = nla_memdup(attr, GFP_KERNEL);
filter[i].len = nla_len(attr);
i++;
}