From 0c5d44a8142d1ede05943845793d3d8a2f10c338 Mon Sep 17 00:00:00 2001
From: Andrey Konovalov <andreyknvl@google.com>
Date: Mon, 20 Nov 2023 18:47:00 +0100
Subject: [PATCH] lib/stackdepot: check disabled flag when fetching

Do not try fetching a stack trace from the stack depot if the
stack_depot_disabled flag is enabled.

Link: https://lkml.kernel.org/r/c3bfa3b7ab00b2e48ab75a3fbb9c67555777cb08.1700502145.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 lib/stackdepot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 0eeaef4f2523..f8a8033e1dc8 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -483,7 +483,7 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle,
 	 */
 	kmsan_unpoison_memory(entries, sizeof(*entries));
 
-	if (!handle)
+	if (!handle || stack_depot_disabled)
 		return 0;
 
 	if (parts.pool_index > pool_index_cached) {