This is a note to let you know that I've just added the patch titled
ieee802154: hwsim: Fix possible memory leaks
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ieee802154-hwsim-fix-possible-memory-leaks.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit bcf571d2599c36432ba4e4e316e691030d7877fd
Author: Chen Aotian <chenaotian2@xxxxxxx>
Date: Sun Apr 9 10:20:48 2023 +0800
ieee802154: hwsim: Fix possible memory leaks
[ Upstream commit a61675294735570daca3779bd1dbb3715f7232bd ]
After replacing e->info, it is necessary to free the old einfo.
Fixes: f25da51fdc38 ("ieee802154: hwsim: add replacement for fakelb")
Reviewed-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Reviewed-by: Alexander Aring <aahringo@xxxxxxxxxx>
Signed-off-by: Chen Aotian <chenaotian2@xxxxxxx>
Link: https://lore.kernel.org/r/20230409022048.61223-1-chenaotian2@xxxxxxx
Signed-off-by: Stefan Schmidt <stefan@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ieee802154/mac802154_hwsim.c b/drivers/net/ieee802154/mac802154_hwsim.c
index 1d181eff0c299..4028cbe275d67 100644
--- a/drivers/net/ieee802154/mac802154_hwsim.c
+++ b/drivers/net/ieee802154/mac802154_hwsim.c
@@ -522,7 +522,7 @@ static int hwsim_del_edge_nl(struct sk_buff *msg, struct genl_info *info)
static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
{
struct nlattr *edge_attrs[MAC802154_HWSIM_EDGE_ATTR_MAX + 1];
- struct hwsim_edge_info *einfo;
+ struct hwsim_edge_info *einfo, *einfo_old;
struct hwsim_phy *phy_v0;
struct hwsim_edge *e;
u32 v0, v1;
@@ -560,8 +560,10 @@ static int hwsim_set_edge_lqi(struct sk_buff *msg, struct genl_info *info)
list_for_each_entry_rcu(e, &phy_v0->edges, list) {
if (e->endpoint->idx == v1) {
einfo->lqi = lqi;
- rcu_assign_pointer(e->info, einfo);
+ einfo_old = rcu_replace_pointer(e->info, einfo,
+ lockdep_is_held(&hwsim_phys_lock));
rcu_read_unlock();
+ kfree_rcu(einfo_old, rcu);
mutex_unlock(&hwsim_phys_lock);
return 0;
}
