From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org,
Andrew Morton <akpm@linux-foundation.org>, Qian Cai <cai@lca.pw>
Subject: [PATCH] mm: kmemleak: Disable early logging in case of error
Date: Wed, 31 Jul 2019 16:23:02 +0100 [thread overview]
Message-ID: <20190731152302.42073-1-catalin.marinas@arm.com> (raw)
If an error occurs during kmemleak_init() (e.g. kmem cache cannot be
created), kmemleak is disabled but kmemleak_early_log remains enabled.
Subsequently, when the .init.text section is freed, the log_early()
function no longer exists. To avoid a page fault in such scenario,
ensure that kmemleak_disable() also disables early logging.
Cc: Andrew Morton <akpm@linux-foundation.org>
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
---
mm/kmemleak.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/kmemleak.c b/mm/kmemleak.c
index 6e9e8cca663e..f6e602918dac 100644
--- a/mm/kmemleak.c
+++ b/mm/kmemleak.c
@@ -1966,6 +1966,7 @@ static void kmemleak_disable(void)
/* stop any memory operation tracing */
kmemleak_enabled = 0;
+ kmemleak_early_log = 0;
/* check whether it is too early for a kernel thread */
if (kmemleak_initialized)
@@ -2009,7 +2010,6 @@ void __init kmemleak_init(void)
#ifdef CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF
if (!kmemleak_skip_disable) {
- kmemleak_early_log = 0;
kmemleak_disable();
return;
}
reply other threads:[~2019-07-31 15:23 UTC|newest]
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