module: tracking: Keep a record of tainted unloaded modules only

This ensures that no module record/or entry is added to the unloaded_tainted_modules list if it does not carry a taint. Reported-by: Alexey Dobriyan <[email protected]> Fixes: 99bd995 ("module: Introduce module unload taint tracking") Signed-off-by: Aaron Tomlin <[email protected]> Acked-by: Luis Chamberlain <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
kawasaki · Oct 10, 2022 · 47cc75a · 47cc75a
1 parent 385f4a1
commit 47cc75a
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/kernel/module/tracking.c b/kernel/module/tracking.c
@@ -22,6 +22,9 @@ int try_add_tainted_module(struct module *mod)
 
 	module_assert_mutex_or_preempt();
 
+	if (!mod->taints)
+		goto out;
+
 	list_for_each_entry_rcu(mod_taint, &unloaded_tainted_modules, list,
 				lockdep_is_held(&module_mutex)) {
 		if (!strcmp(mod_taint->name, mod->name) &&