From: Johannes Berg Date: Mon, 31 Aug 2020 18:28:05 +0000 (+0200) Subject: netlink: policy: correct validation type check X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=c30a3c957c885e618ddffc065f888be4f8d5a9bd;p=linux.git netlink: policy: correct validation type check 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: 8aa26c575fb3 ("netlink: make NLA_BINARY validation more flexible") Signed-off-by: Johannes Berg Signed-off-by: David S. Miller --- diff --git a/net/netlink/policy.c b/net/netlink/policy.c index 7b1f50531cd30..5c9e7530865fe 100644 --- a/net/netlink/policy.c +++ b/net/netlink/policy.c @@ -264,7 +264,8 @@ send_attribute: 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);