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mm: kmemleak: disable early logging in case of error 

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.

Link: http://lkml.kernel.org/r/20190731152302.42073-1-catalin.marinas@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Reported-by: Qian Cai <cai@lca.pw>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Catalin Marinas 2019-08-13 15:37:34 -07:00 committed by Linus Torvalds
parent 5336e52c9e
commit fcf3a5b62f
1 changed files with 1 additions and 1 deletions
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2
mm/kmemleak.c
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@ -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;
}