mac80211: check return value of rhashtable_init

When rhashtable_init() fails, it returns -EINVAL.
However, since error return value of rhashtable_init is not checked,
it can cause use of uninitialized pointers.
So, fix unhandled errors of rhashtable_init.

Signed-off-by: MichelleJin <shjy180909@gmail.com>
Link: https://lore.kernel.org/r/20210927033457.1020967-4-shjy180909@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

diff --git a/net/mac80211/mesh_pathtbl.c b/net/mac80211/mesh_pathtbl.c
index efbefcb..7cab1cf 100644 (file)
--- a/net/mac80211/mesh_pathtbl.c
+++ b/net/mac80211/mesh_pathtbl.c
@@ -60,7 +60,10 @@ static struct mesh_table *mesh_table_alloc(void)
        atomic_set(&newtbl->entries,  0);
        spin_lock_init(&newtbl->gates_lock);
        spin_lock_init(&newtbl->walk_lock);
-       rhashtable_init(&newtbl->rhead, &mesh_rht_params);
+       if (rhashtable_init(&newtbl->rhead, &mesh_rht_params)) {
+               kfree(newtbl);
+               return NULL;
+       }
 
        return newtbl;
 }