Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 4.14 06/23] livepatch: Nullify obj->mod in klp_module_coming()'s error path | Date | Sun, 29 Sep 2019 13:35:16 -0400 |
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From: Miroslav Benes <mbenes@suse.cz>
[ 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@suse.cz> Reviewed-by: Petr Mladek <pmladek@suse.com> Acked-by: Josh Poimboeuf <jpoimboe@redhat.com> Signed-off-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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
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