linux-kernel - [PATCH v3] clk/ti/adpll: allocate room for terminating null

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Date:   Sat, 19 Oct 2019 16:06:34 +0200
From:   Stephen Kitt <steve@....org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Michael Turquette <mturquette@...libre.com>,
        Tero Kristo <t-kristo@...com>,
        Tony Lindgren <tony@...mide.com>, linux-clk@...r.kernel.org,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephen Kitt <steve@....org>
Subject: [PATCH v3] clk/ti/adpll: allocate room for terminating null

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>
---
Changes since v2:
  - Move "adpll" into the format string and drop base_name entirely.

Changes since v1:
  - Use devm_kasprintf instead of manually allocating the target
    buffer.
---
 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 fdfb90058504..bb2f2836dab2 100644
--- a/drivers/clk/ti/adpll.c
+++ b/drivers/clk/ti/adpll.c
@@ -194,15 +194,8 @@ 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;
-- 
2.20.1