Lock out table resizes while dumping Netlink sockets to user space.
This keeps disruptions to a minimum for readers which don't handle
the NLM_F_DUMP_INTR flag.
Signed-off-by: Thomas Graf <tgraf@xxxxxxx>
---
net/netlink/diag.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/netlink/diag.c b/net/netlink/diag.c
index 50aa385..be4ea6e 100644
--- a/net/netlink/diag.c
+++ b/net/netlink/diag.c
@@ -114,6 +114,8 @@ static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
req = nlmsg_data(cb->nlh);
cb->seq = atomic_read(&nl_table_seq);
+ mutex_lock(&ht->mutex);
+
for (i = 0; i < htbl->size; i++) {
struct rhash_head *pos;
@@ -161,6 +163,7 @@ static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
num++;
}
done:
+ mutex_unlock(&ht->mutex);
cb->args[0] = num;
cb->args[1] = protocol;
--
1.9.3
--
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