module: Fix load_module() error path

The load_module() error path frees a module but forgot to take it out
of the mod_tree, leaving a dangling entry in the tree, causing havoc.

Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
Tested-by: Arthur Marsh <arthur.marsh@internode.on.net>
Fixes: 93c2e105f6bc ("module: Optimize __module_address() using a latched RB-tree")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

diff --git a/kernel/module.c b/kernel/module.c
index 3e0e197..4d2b82e 100644 (file)
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3557,6 +3557,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
        mutex_lock(&module_mutex);
        /* Unlink carefully: kallsyms could be walking list. */
        list_del_rcu(&mod->list);
+       mod_tree_remove(mod);
        wake_up_all(&module_wq);
        /* Wait for RCU-sched synchronizing before releasing mod->list. */
        synchronize_sched();