@@ -459,6 +459,18 @@ static unsigned int fill_remote_addresses_vec(struct mptcp_sock *msk, bool fullm
return i;
}
+static struct mptcp_pm_addr_entry *
+__lookup_addr(struct pm_nl_pernet *pernet, struct mptcp_addr_info *info)
+{
+ struct mptcp_pm_addr_entry *entry;
+
+ list_for_each_entry(entry, &pernet->local_addr_list, list) {
+ if (addresses_equal(&entry->addr, info, true))
+ return entry;
+ }
+ return NULL;
+}
+
static void mptcp_pm_create_subflow_or_signal_addr(struct mptcp_sock *msk)
{
struct sock *sk = (struct sock *)msk;
@@ -1725,17 +1737,21 @@ static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
bkup = 1;
- list_for_each_entry(entry, &pernet->local_addr_list, list) {
- if (addresses_equal(&entry->addr, &addr.addr, true)) {
- mptcp_nl_addr_backup(net, &entry->addr, bkup);
-
- if (bkup)
- entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP;
- else
- entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP;
- }
+ spin_lock_bh(&pernet->lock);
+ entry = __lookup_addr(pernet, &addr.addr);
+ if (!entry) {
+ spin_unlock_bh(&pernet->lock);
+ return -EINVAL;
}
+ if (bkup)
+ entry->flags |= MPTCP_PM_ADDR_FLAG_BACKUP;
+ else
+ entry->flags &= ~MPTCP_PM_ADDR_FLAG_BACKUP;
+ addr = *entry;
+ spin_unlock_bh(&pernet->lock);
+
+ mptcp_nl_addr_backup(net, &addr.addr, bkup);
return 0;
}
commit 8e9eacad7ec7a9cbf262649ebf1fa6e6f6cc7d82 upstream. The upstream commit had to handle a lookup_by_id variable that is only present in 5.17. This version of the patch removes that variable, so the __lookup_addr() function only handles the lookup as it is implemented in 5.15 and 5.16. It also removes one 'const' keyword to prevent a warning due to differing const-ness in the 5.17 version of addresses_equal(). The MPTCP endpoint list is under RCU protection, guarded by the pernet spinlock. mptcp_nl_cmd_set_flags() traverses the list without acquiring the spin-lock nor under the RCU critical section. This change addresses the issue performing the lookup and the endpoint update under the pernet spinlock. Fixes: 0f9f696a502e ("mptcp: add set_flags command in PM netlink") Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> --- Paolo, can I add an ack or signoff tag from you? The upstream commit (8e9eacad7ec7) was queued for the 5.16 and 5.15 stable trees, which brought along a few extra patches that didn't belong in stable. I asked Greg to drop those patches from his queue, and this particular commit required manual changes as described above (related to the lookup_by_id variable that's new in 5.16). This patch will not apply to the export branch. I confirmed that it applies, builds, and runs on both the 5.16.5 and 5.15.19 branches. Self tests succeed too. When I send to the stable list, I'll also include these tags: Cc: <stable@vger.kernel.org> # 5.15.x Cc: <stable@vger.kernel.org> # 5.16.x --- net/mptcp/pm_netlink.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-)