FAILED: patch "[PATCH] apparmor: fix refcount leak in aa_get_newest_profile()" failed to apply to 5.10-stable tree

[Sasha Levin <sashal@kernel.org>]

The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 33ed50716251d5b2875706c40d0c8082d46be0b1
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '20261107063050-failed-5.10-33ed50716251@kernel.org' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From 33ed50716251d5b2875706c40d0c8082d46be0b1 Mon Sep 17 00:00:00 2001
From: John Johansen <john.johansen@canonical.com>
Date: Tue, 20 Oct 2026 16:00:30 -0700
Subject: [PATCH] apparmor: fix refcount leak in aa_get_newest_profile()

The labels_profile() macro is evaluating its argument twice

  #define labels_profile(X) ((X)->vec[(X)->size - 1])

unfortunately aa_get_newest_profile() passes
   aa_get_newest_label(&p->label)
so every call to aa_get_newest_profile results in 2 refcounts
being taken with one being leaked.

There is no need for labels_profile() to be a macro. Convert it to
an inline fn, which ensures all uses are passing the correct struct
and removes the double evaluation.

Fixes: 637f688dc3dc ("apparmor: switch from profiles to using labels on contexts")
Cc: stable@vger.kernel.org
Reported-by: Georgia Garcia <georgia.garcia@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
---
 security/apparmor/include/label.h | 6 +++++-
 security/apparmor/label.c         | 1 -
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/security/apparmor/include/label.h b/security/apparmor/include/label.h
index 2c869b7dec973..61794b9cd6be6 100644
--- a/security/apparmor/include/label.h
+++ b/security/apparmor/include/label.h
@@ -162,7 +162,11 @@ do {							\
 #define labels_ns(X) (vec_ns(&((X)->vec[0]), (X)->size))
 #define labels_set(X) (&labels_ns(X)->labels)
 #define labels_view(X) labels_ns(X)
-#define labels_profile(X) ((X)->vec[(X)->size - 1])
+
+static inline struct aa_profile *labels_profile(const struct aa_label *label)
+{
+	return label->vec[label->size - 1];
+}
 
 
 int aa_label_next_confined(const struct aa_label *l, int i);
diff --git a/security/apparmor/label.c b/security/apparmor/label.c
index 82742a4710552..42ed476fe89d9 100644
--- a/security/apparmor/label.c
+++ b/security/apparmor/label.c
@@ -387,7 +387,6 @@ void aa_label_kref(struct kref *kref)
 		label_free_switch(label);
 		return;
 	}
-	/* TODO: update labels_profile macro so it works here */
 	AA_BUG(label_isprofile(label) &&
 	       on_list_rcu(&label->vec[0]->base.profiles));
 	AA_BUG(label_isprofile(label) &&
-- 
2.53.0