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| author |   Michal Kubecek <mkubecek@suse.cz> | 2019-05-02 16:15:10 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-05-04 01:27:11 -0400 |
| commit | b424e432e770d6dd572765459d5b6a96a19c5286 (patch) | |
| tree | f2aad0917c7a2e619bca6eefa82eb6b3355fb537 /lib | |
| parent | netlink: set bad attribute also on maxtype check (diff) | |
| download | linux-dev-b424e432e770d6dd572765459d5b6a96a19c5286.tar.xz linux-dev-b424e432e770d6dd572765459d5b6a96a19c5286.zip | |
netlink: add validation of NLA_F_NESTED flag
Add new validation flag NL_VALIDATE_NESTED which adds three consistency
checks of NLA_F_NESTED_FLAG:
- the flag is set on attributes with NLA_NESTED{,_ARRAY} policy
- the flag is not set on attributes with other policies except NLA_UNSPEC
- the flag is set on attribute passed to nla_parse_nested()
Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
v2: change error messages to mention NLA_F_NESTED explicitly
Reviewed-by: Johannes Berg <johannes@sipsolutions.net>
Reviewed-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/nlattr.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/nlattr.c b/lib/nlattr.c index adc919b32bf9..cace9b307781 100644 --- a/lib/nlattr.c +++ b/lib/nlattr.c @@ -184,6 +184,21 @@ static int validate_nla(const struct nlattr *nla, int maxtype, } } + if (validate & NL_VALIDATE_NESTED) { + if ((pt->type == NLA_NESTED || pt->type == NLA_NESTED_ARRAY) && + !(nla->nla_type & NLA_F_NESTED)) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "NLA_F_NESTED is missing"); + return -EINVAL; + } + if (pt->type != NLA_NESTED && pt->type != NLA_NESTED_ARRAY && + pt->type != NLA_UNSPEC && (nla->nla_type & NLA_F_NESTED)) { + NL_SET_ERR_MSG_ATTR(extack, nla, + "NLA_F_NESTED not expected"); + return -EINVAL; + } + } + switch (pt->type) { case NLA_EXACT_LEN: if (attrlen != pt->len) |