linux-kernel - [PATCH] mfd: aat2870: Use scnprintf() for avoiding potential buffer overflow

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Message-Id: <20200311074738.8679-1-tiwai@suse.de>
Date:   Wed, 11 Mar 2020 08:47:38 +0100
From:   Takashi Iwai <tiwai@...e.de>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] mfd: aat2870: Use scnprintf() for avoiding potential buffer overflow

There is still one call of sprintf() without checking the proper
buffer overflow in aat2870_dump_reg().  Replace it with scnprintf()
call for covering that.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
---
 drivers/mfd/aat2870-core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mfd/aat2870-core.c b/drivers/mfd/aat2870-core.c
index 78ee4b28fca2..a17cf759739d 100644
--- a/drivers/mfd/aat2870-core.c
+++ b/drivers/mfd/aat2870-core.c
@@ -221,7 +221,7 @@ static ssize_t aat2870_dump_reg(struct aat2870_data *aat2870, char *buf)
 
 	count += sprintf(buf, "aat2870 registers\n");
 	for (addr = 0; addr < AAT2870_REG_NUM; addr++) {
-		count += sprintf(buf + count, "0x%02x: ", addr);
+		count += snprintf(buf + count, PAGE_SIZE - count, "0x%02x: ", addr);
 		if (count >= PAGE_SIZE - 1)
 			break;
 
-- 
2.16.4