linux-kernel - [PATCH] staging: most: use format specifier "%s" in snprintf

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Message-Id: <20181109115645.18279-1-colin.king@canonical.com>
Date:   Fri,  9 Nov 2018 11:56:45 +0000
From:   Colin King <colin.king@...onical.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Christian Gromm <christian.gromm@...rochip.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org
Subject: [PATCH] staging: most: use format specifier "%s" in snprintf

From: Colin Ian King <colin.king@...onical.com>

Passing string ch_data_type[i].name as the format specifier is
potentially hazardous because it could (although very unlikely to)
have a format specifier embedded in it causing issues when parsing
the non-existent arguments to these.  Follow best practice by using
the "%s" format string for the string.

Cleans up clang warning:
format string is not a string literal (potentially insecure) [-Wformat-security]

Fixes: e7f2b70fd3a9 ("staging: most: replace multiple if..else with table lookup")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/staging/most/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/most/core.c b/drivers/staging/most/core.c
index 6a18cf73c85e..18936cdb1083 100644
--- a/drivers/staging/most/core.c
+++ b/drivers/staging/most/core.c
@@ -351,7 +351,7 @@ static ssize_t set_datatype_show(struct device *dev,
 
 	for (i = 0; i < ARRAY_SIZE(ch_data_type); i++) {
 		if (c->cfg.data_type & ch_data_type[i].most_ch_data_type)
-			return snprintf(buf, PAGE_SIZE, ch_data_type[i].name);
+			return snprintf(buf, PAGE_SIZE, "%s", ch_data_type[i].name);
 	}
 	return snprintf(buf, PAGE_SIZE, "unconfigured\n");
 }
-- 
2.19.1