linux-kernel - [PATCH 4.9 020/121] clk/ti/adpll: allocate room for terminating null

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Date:   Tue, 29 Sep 2020 12:59:24 +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, Stephen Kitt <steve@....org>,
        Tony Lindgren <tony@...mide.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 020/121] clk/ti/adpll: allocate room for terminating null

From: Stephen Kitt <steve@....org>

[ Upstream commit 7f6ac72946b88b89ee44c1c527aa8591ac5ffcbe ]

The buffer allocated in ti_adpll_clk_get_name doesn't account for the
terminating null. This patch switches to devm_kasprintf to avoid
overflowing.

Signed-off-by: Stephen Kitt <steve@....org>
Link: https://lkml.kernel.org/r/20191019140634.15596-1-steve@sk2.org
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/ti/adpll.c | 11 ++---------
 1 file changed, 2 insertions(+), 9 deletions(-)

diff --git a/drivers/clk/ti/adpll.c b/drivers/clk/ti/adpll.c
index 255cafb18336a..9345eaf00938e 100644
--- a/drivers/clk/ti/adpll.c
+++ b/drivers/clk/ti/adpll.c
@@ -193,15 +193,8 @@ static const char *ti_adpll_clk_get_name(struct ti_adpll_data *d,
 		if (err)
 			return NULL;
 	} else {
-		const char *base_name = "adpll";
-		char *buf;
-
-		buf = devm_kzalloc(d->dev, 8 + 1 + strlen(base_name) + 1 +
-				    strlen(postfix), GFP_KERNEL);
-		if (!buf)
-			return NULL;
-		sprintf(buf, "%08lx.%s.%s", d->pa, base_name, postfix);
-		name = buf;
+		name = devm_kasprintf(d->dev, GFP_KERNEL, "%08lx.adpll.%s",
+				      d->pa, postfix);
 	}
 
 	return name;
-- 
2.25.1