[PATCH 6.18.y 4/5] landlock: Use mem_is_zero() in is_layer_masks_allowed()

[Sasha Levin <sashal@kernel.org>]

From: Günther Noack <gnoack3000@gmail.com>

[ Upstream commit 1c4fe87364782d1b058cc9d15fc8acef44bce033 ]

This is equivalent, but expresses the intent a bit clearer.

Signed-off-by: Günther Noack <gnoack3000@gmail.com>
Link: https://lore.kernel.org/r/20260327164838.38231-3-gnoack3000@gmail.com
Signed-off-by: Mickaël Salaün <mic@digikod.net>
Stable-dep-of: 2c6dc7925382 ("landlock: Fix use-after-free of the source's parent directory")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 security/landlock/fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/landlock/fs.c b/security/landlock/fs.c
index 3fa30715531c6..a9a5fc5ba1bb8 100644
--- a/security/landlock/fs.c
+++ b/security/landlock/fs.c
@@ -559,7 +559,7 @@ static void test_no_more_access(struct kunit *const test)
 
 static bool is_layer_masks_allowed(const struct layer_access_masks *masks)
 {
-	return !memchr_inv(&masks->access, 0, sizeof(masks->access));
+	return mem_is_zero(&masks->access, sizeof(masks->access));
 }
 
 /*
-- 
2.53.0