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genetlink: load policy based on validation flags

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Set the policy and maxattr pointers based on validation flags.
genl_family_rcv_msg_attrs_parse() will do nothing and return NULL
if maxattrs is zero, so no behavior change is expected.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2022-11-04 12:13:34 -07:00 committed by David S. Miller
parent 20b0b53aca
commit 7747eb75f6
1 changed files with 10 additions and 7 deletions
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17
net/netlink/genetlink.c
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@ -204,8 +204,14 @@ genl_cmd_full_to_split(struct genl_split_ops *op,
op->post_doit = family->post_doit;
}
op->policy = full->policy;
op->maxattr = full->maxattr;
if (flags & GENL_CMD_CAP_DUMP &&
full->validate & GENL_DONT_VALIDATE_DUMP) {
op->policy = NULL;
op->maxattr = 0;
} else {
op->policy = full->policy;
op->maxattr = full->maxattr;
}
op->cmd = full->cmd;
op->internal_flags = full->internal_flags;
@ -638,10 +644,8 @@ static int genl_start(struct netlink_callback *cb)
int rc = 0;
ops = ctx->ops;
if (ops->validate & GENL_DONT_VALIDATE_DUMP)
goto no_attrs;
if (ctx->nlh->nlmsg_len < nlmsg_msg_size(ctx->hdrlen))
if (!(ops->validate & GENL_DONT_VALIDATE_DUMP) &&
ctx->nlh->nlmsg_len < nlmsg_msg_size(ctx->hdrlen))
return -EINVAL;
attrs = genl_family_rcv_msg_attrs_parse(ctx->family, ctx->nlh, ctx->extack,
@ -650,7 +654,6 @@ static int genl_start(struct netlink_callback *cb)
if (IS_ERR(attrs))
return PTR_ERR(attrs);
no_attrs:
info = genl_dumpit_info_alloc();
if (!info) {
genl_family_rcv_msg_attrs_free(attrs);