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sctp: Hold sock lock while iterating over address list

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Move address list traversal in inet_assoc_attr_size() under the sock
lock to avoid holding the RCU read lock.

Suggested-by: Xin Long <lucien.xin@gmail.com>
Fixes: 8f840e47f1 ("sctp: add the sctp_diag.c file")
Signed-off-by: Stefan Wiehler <stefan.wiehler@nokia.com>
Acked-by: Xin Long <lucien.xin@gmail.com>
Link: https://patch.msgid.link/20251028161506.3294376-4-stefan.wiehler@nokia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Stefan Wiehler
2025-10-28 17:12:28 +01:00
committed by Jakub Kicinski
parent 95aef86ab2
commit f1fc201148
1 changed files with 10 additions and 6 deletions
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16
net/sctp/diag.c
View File

@@ -230,14 +230,15 @@ struct sctp_comm_param {
bool net_admin;
};
static size_t inet_assoc_attr_size(struct sctp_association *asoc)
static size_t inet_assoc_attr_size(struct sock *sk,
struct sctp_association *asoc)
{
int addrlen = sizeof(struct sockaddr_storage);
int addrcnt = 0;
struct sctp_sockaddr_entry *laddr;
list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
list)
list, lockdep_sock_is_held(sk))
addrcnt++;
return nla_total_size(sizeof(struct sctp_info))
@@ -263,11 +264,14 @@ static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *t
if (err)
return err;
rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
if (!rep)
return -ENOMEM;
lock_sock(sk);
rep = nlmsg_new(inet_assoc_attr_size(sk, assoc), GFP_KERNEL);
if (!rep) {
release_sock(sk);
return -ENOMEM;
}
if (ep != assoc->ep) {
err = -EAGAIN;
goto out;