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netlink: policy: correct validation type check

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In the policy export for binary attributes I erroneously used
a != NLA_VALIDATE_NONE comparison instead of checking for the
two possible values, which meant that if a validation function
pointer ended up aliasing the min/max as negatives, we'd hit
a warning in nla_get_range_unsigned().

Fix this to correctly check for only the two types that should
be handled here, i.e. range with or without warn-too-long.

Reported-by: syzbot+353df1490da781637624@syzkaller.appspotmail.com
Fixes: 8aa26c575f ("netlink: make NLA_BINARY validation more flexible")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Johannes Berg 2020-08-31 20:28:05 +02:00 committed by David S. Miller
parent 0f091e4331
commit c30a3c957c
1 changed files with 2 additions and 1 deletions
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3
net/netlink/policy.c
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@ -264,7 +264,8 @@ int netlink_policy_dump_write(struct sk_buff *skb, unsigned long _state)
else
type = NL_ATTR_TYPE_BINARY;
if (pt->validation_type != NLA_VALIDATE_NONE) {
if (pt->validation_type == NLA_VALIDATE_RANGE ||
pt->validation_type == NLA_VALIDATE_RANGE_WARN_TOO_LONG) {
struct netlink_range_validation range;
nla_get_range_unsigned(pt, &range);