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authorJiri Pirko <jiri@mellanox.com>2019-10-05 20:04:35 +0200
committerDavid S. Miller <davem@davemloft.net>2019-10-06 15:44:46 +0200
commitc10e6cf85e7d984a156052daeedaf20a1f38824f (patch)
tree0bf717b0b51b394899fe5f043a0d3b03f46fb7d7 /net/netlink/genetlink.c
parent1927f41a22a05e3bc178fa47f7ce7be271fbc541 (diff)
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net: genetlink: push attrbuf allocation and parsing to a separate function
To be re-usable by dumpit as well, push the code that is taking care of attrbuf allocation and parting from doit into separate function. Introduce a helper to free the buffer too. Check family->maxattr too before calling kfree() to be symmetrical with the allocation check. Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/netlink/genetlink.c')
-rw-r--r--net/netlink/genetlink.c67
1 files changed, 45 insertions, 22 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index c785080e9401..a98c94594508 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -468,6 +468,45 @@ static void genl_dumpit_info_free(const struct genl_dumpit_info *info)
kfree(info);
}
+static struct nlattr **
+genl_family_rcv_msg_attrs_parse(const struct genl_family *family,
+ struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack,
+ const struct genl_ops *ops,
+ int hdrlen,
+ enum genl_validate_flags no_strict_flag)
+{
+ enum netlink_validation validate = ops->validate & no_strict_flag ?
+ NL_VALIDATE_LIBERAL :
+ NL_VALIDATE_STRICT;
+ struct nlattr **attrbuf;
+ int err;
+
+ if (family->maxattr && family->parallel_ops) {
+ attrbuf = kmalloc_array(family->maxattr + 1,
+ sizeof(struct nlattr *), GFP_KERNEL);
+ if (!attrbuf)
+ return ERR_PTR(-ENOMEM);
+ } else {
+ attrbuf = family->attrbuf;
+ }
+
+ err = __nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
+ family->policy, validate, extack);
+ if (err && family->maxattr && family->parallel_ops) {
+ kfree(attrbuf);
+ return ERR_PTR(err);
+ }
+ return attrbuf;
+}
+
+static void genl_family_rcv_msg_attrs_free(const struct genl_family *family,
+ struct nlattr **attrbuf)
+{
+ if (family->maxattr && family->parallel_ops)
+ kfree(attrbuf);
+}
+
static int genl_lock_start(struct netlink_callback *cb)
{
const struct genl_ops *ops = genl_dumpit_info(cb)->ops;
@@ -599,26 +638,11 @@ static int genl_family_rcv_msg_doit(const struct genl_family *family,
if (!ops->doit)
return -EOPNOTSUPP;
- if (family->maxattr && family->parallel_ops) {
- attrbuf = kmalloc_array(family->maxattr + 1,
- sizeof(struct nlattr *),
- GFP_KERNEL);
- if (attrbuf == NULL)
- return -ENOMEM;
- } else
- attrbuf = family->attrbuf;
-
- if (attrbuf) {
- enum netlink_validation validate = NL_VALIDATE_STRICT;
-
- if (ops->validate & GENL_DONT_VALIDATE_STRICT)
- validate = NL_VALIDATE_LIBERAL;
-
- err = __nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
- family->policy, validate, extack);
- if (err < 0)
- goto out;
- }
+ attrbuf = genl_family_rcv_msg_attrs_parse(family, nlh, extack,
+ ops, hdrlen,
+ GENL_DONT_VALIDATE_STRICT);
+ if (IS_ERR(attrbuf))
+ return PTR_ERR(attrbuf);
info.snd_seq = nlh->nlmsg_seq;
info.snd_portid = NETLINK_CB(skb).portid;
@@ -642,8 +666,7 @@ static int genl_family_rcv_msg_doit(const struct genl_family *family,
family->post_doit(ops, skb, &info);
out:
- if (family->parallel_ops)
- kfree(attrbuf);
+ genl_family_rcv_msg_attrs_free(family, attrbuf);
return err;
}