linux-kernel - [PATCH 4.4 016/131] mmc: debugfs: Add a restriction to mmc debugfs clock setting

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Date:   Mon,  1 Apr 2019 19:01:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Yuan Juntao <juntaox.yuan@...el.com>,
        Pawel Wodkowski <pawelx.wodkowski@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 4.4 016/131] mmc: debugfs: Add a restriction to mmc debugfs clock setting

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chuanxiao Dong <chuanxiao.dong@...el.com>

commit e5905ff1281f0a0f5c9863c430ac1ed5faaf5707 upstream.

Clock frequency values written to an mmc host should not be less than
the minimum clock frequency which the mmc host supports.

Signed-off-by: Yuan Juntao <juntaox.yuan@...el.com>
Signed-off-by: Pawel Wodkowski <pawelx.wodkowski@...el.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/core/debugfs.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -220,7 +220,7 @@ static int mmc_clock_opt_set(void *data,
 	struct mmc_host *host = data;
 
 	/* We need this check due to input value is u64 */
-	if (val > host->f_max)
+	if (val != 0 && (val > host->f_max || val < host->f_min))
 		return -EINVAL;
 
 	mmc_claim_host(host);