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* [PATCH AUTOSEL 5.2 12/42] livepatch: Nullify obj->mod in klp_module_coming()'s error path
       [not found] <20190929173244.8918-1-sashal@kernel.org>
@ 2019-09-29 17:32 ` Sasha Levin
  0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2019-09-29 17:32 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Miroslav Benes, Petr Mladek, Josh Poimboeuf, Sasha Levin, live-patching

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 c4ce08f43bd63..ab4a4606d19b7 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -1175,6 +1175,7 @@ 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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2019-09-29 17:32 ` [PATCH AUTOSEL 5.2 12/42] livepatch: Nullify obj->mod in klp_module_coming()'s error path Sasha Levin

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