netdev - [patch net-next v3 01/10] genetlink: don't merge dumpit split op for different cmds into single iter

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Date: Sat, 21 Oct 2023 13:27:02 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	pabeni@...hat.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	jacob.e.keller@...el.com,
	johannes@...solutions.net
Subject: [patch net-next v3 01/10] genetlink: don't merge dumpit split op for different cmds into single iter

From: Jiri Pirko <jiri@...dia.com>

Currently, split ops of doit and dumpit are merged into a single iter
item when they are subsequent. However, there is no guarantee that the
dumpit op is for the same cmd as doit op.

Fix this by checking if cmd is the same for both.

Fixes: b8fd60c36a44 ("genetlink: allow families to use split ops directly")
Signed-off-by: Jiri Pirko <jiri@...dia.com>
---
v1->v2:
- removed redundant cnt check
---
 net/netlink/genetlink.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c
index 8315d31b53db..92ef5ed2e7b0 100644
--- a/net/netlink/genetlink.c
+++ b/net/netlink/genetlink.c
@@ -225,7 +225,8 @@ static void genl_op_from_split(struct genl_op_iter *iter)
 	}
 
 	if (i + cnt < family->n_split_ops &&
-	    family->split_ops[i + cnt].flags & GENL_CMD_CAP_DUMP) {
+	    family->split_ops[i + cnt].flags & GENL_CMD_CAP_DUMP &&
+	    (!cnt || family->split_ops[i + cnt].cmd == iter->doit.cmd)) {
 		iter->dumpit = family->split_ops[i + cnt];
 		genl_op_fill_in_reject_policy_split(family, &iter->dumpit);
 		cnt++;
-- 
2.41.0