linux-kernel - [PATCH] livepatch: fix merge bug in klp_cleanup_module_patches

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Date:   Tue, 31 Oct 2017 14:53:31 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>,
        Jessica Yu <jeyu@...hat.com>
Cc:     live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
        Joe Lawrence <joe.lawrence@...hat.com>
Subject: [PATCH] livepatch: fix merge bug in klp_cleanup_module_patches_limited()

When the patch for "livepatch: add (un)patch callbacks" was posted to
the mailing list at:

  https://lkml.kernel.org/r/1507921723-1996-2-git-send-email-joe.lawrence@redhat.com

... it was based on top of the following commit:

  ef8daf8eeb5b ("livepatch: unpatch all klp_objects if klp_module_coming fails").

But when it was applied to git on the livepatching
for-4.15/shadow-variables branch, that branch was missing the above
commit.  The patch was rebased accordingly:

  93862e385ded ("livepatch: add (un)patch callbacks")

Then the two above commits were merged into livepatching/for-next:

  6a18fdf2d8d3 ("Merge branch 'for-4.15/callbacks' into for-next"),

The result of the merge commit was that the klp_post_unpatch_callback()
call in the klp_cleanup_module_patches_limited() function disappeared.
The original patch on the mailing list had that call, so put it back.

Fixes: 6a18fdf2d8d3 ("Merge branch 'for-4.15/callbacks' into for-next")
Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
---
 kernel/livepatch/core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/livepatch/core.c b/kernel/livepatch/core.c
index 30e392858281..de9e45dca70f 100644
--- a/kernel/livepatch/core.c
+++ b/kernel/livepatch/core.c
@@ -875,6 +875,8 @@ static void klp_cleanup_module_patches_limited(struct module *mod,
 				pr_notice("reverting patch '%s' on unloading module '%s'\n",
 					  patch->mod->name, obj->mod->name);
 				klp_unpatch_object(obj);
+
+				klp_post_unpatch_callback(obj);
 			}

 			klp_free_object_loaded(obj);
-- 
2.13.6