linux-kernel - [PATCH] scs: Fix a wrong parameter in __scs

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Date:   Mon,  4 Jul 2022 15:04:03 +0800
From:   Wan Jiabing <wanjiabing@...o.com>
To:     Marco Elver <elver@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will@...nel.org>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Wan Jiabing <wanjiabing@...o.com>,
        Yee Lee <yee.lee@...iatek.com>,
        Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org
Cc:     Xie Jiyuan <xiejiyuan@...o.com>
Subject: [PATCH] scs: Fix a wrong parameter in __scs_magic

__scs_magic() needs a 'void *' variable, but a 'struct task_struct *'
is given. 'task_scs(tsk)' is the starting address of the task's shadow
call stack, and '__scs_magic(task_scs(tsk))' is the end address of the
task's shadow call stack.
Here should be '__scs_magic(task_scs(tsk))'.

Fixes: 5bbaf9d1fcb9 ("scs: Add support for stack usage debugging")
Signed-off-by: Xie Jiyuan <xiejiyuan@...o.com>
Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
---
 kernel/scs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/scs.c b/kernel/scs.c
index b7e1b096d906..4c1ce6a6172d 100644
--- a/kernel/scs.c
+++ b/kernel/scs.c
@@ -125,7 +125,7 @@ static void scs_check_usage(struct task_struct *tsk)
 	if (!IS_ENABLED(CONFIG_DEBUG_STACK_USAGE))
 		return;
 
-	for (p = task_scs(tsk); p < __scs_magic(tsk); ++p) {
+	for (p = task_scs(tsk); p < __scs_magic(task_scs(tsk)); ++p) {
 		if (!READ_ONCE_NOCHECK(*p))
 			break;
 		used += sizeof(*p);
-- 
2.37.0