From: Miroslav Benes <mbenes@xxxxxxx>
[ Upstream commit 4ff96fb52c6964ad42e0a878be8f86a2e8052ddd ]
klp_module_coming() is called for every module appearing in the system.
It sets obj->mod to a patched module for klp_object obj. Unfortunately
it leaves it set even if an error happens later in the function and the
patched module is not allowed to be loaded.
klp_is_object_loaded() uses obj->mod variable and could currently give a
wrong return value. The bug is probably harmless as of now.
Signed-off-by: Miroslav Benes <mbenes@xxxxxxx>
Reviewed-by: Petr Mladek <pmladek@xxxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
kernel/livepatch/core.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 88754e9790f9b..f8dc77b18962c 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -941,6 +941,7 @@ int klp_module_coming(struct module *mod)
pr_warn("patch '%s' failed for module '%s', refusing to load module '%s'\n",
patch->mod->name, obj->mod->name, obj->mod->name);
mod->klp_alive = false;
+ obj->mod = NULL;
klp_cleanup_module_patches_limited(mod, patch);
mutex_unlock(&klp_mutex);
--
2.20.1
