netdev - [PATCH net] net: genetlink: return the error code when attribute parsing fails.

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Message-Id: <933cec10232417777c5a214e25a31d1f299d1489.1582310461.git.pabeni@redhat.com>
Date:   Fri, 21 Feb 2020 19:42:13 +0100
From:   Paolo Abeni <pabeni@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jiri Pirko <jiri@...lanox.com>
Subject: [PATCH net] net: genetlink: return the error code when attribute parsing fails.

Currently if attribute parsing fails and the genl family
does not support parallel operation, the error code returned
by __nlmsg_parse() is discarded by genl_family_rcv_msg_attrs_parse().

Be sure to report the error for all genl families.

Fixes: c10e6cf85e7d ("net: genetlink: push attrbuf allocation and parsing to a separate function")
Fixes: ab5b526da048 ("net: genetlink: always allocate separate attrs for dumpit ops")
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
---
Note: the issue is really introduced by the first commit above,
but the fix applies cleanly only after the 2nd one
---
 net/netlink/genetlink.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 0522b2b1fd95..9f357aa22b94 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -497,8 +497,9 @@ genl_family_rcv_msg_attrs_parse(const struct genl_family *family,
 
 	err = __nlmsg_parse(nlh, hdrlen, attrbuf, family->maxattr,
 			    family->policy, validate, extack);
-	if (err && parallel) {
-		kfree(attrbuf);
+	if (err) {
+		if (parallel)
+			kfree(attrbuf);
 		return ERR_PTR(err);
 	}
 	return attrbuf;
-- 
2.21.1