linux-kernel - [PATCH] mmc: mmc_spi: fix snprintf() output buffer size

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Message-ID: <20241007114549.51213-1-brgl@bgdev.pl>
Date: Mon,  7 Oct 2024 13:45:49 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [PATCH] mmc: mmc_spi: fix snprintf() output buffer size

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

GCC 13 complains about the truncated output of snprintf():

drivers/mmc/host/mmc_spi.c: In function ‘mmc_spi_response_get’:
drivers/mmc/host/mmc_spi.c:227:64: error: ‘snprintf’ output may be truncated before the last format character [-Werror=format-truncation=]
  227 |         snprintf(tag, sizeof(tag), "  ... CMD%d response SPI_%s",
      |                                                                ^
drivers/mmc/host/mmc_spi.c:227:9: note: ‘snprintf’ output between 26 and 43 bytes into a destination of size 32
  227 |         snprintf(tag, sizeof(tag), "  ... CMD%d response SPI_%s",
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  228 |                 cmd->opcode, maptype(cmd));

Increase the size of the target buffer.

Fixes: 15a0580ced08 ("mmc_spi host driver")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/mmc/host/mmc_spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c
index 8fee7052f2ef..fa1d1a1b3142 100644
--- a/drivers/mmc/host/mmc_spi.c
+++ b/drivers/mmc/host/mmc_spi.c
@@ -222,7 +222,7 @@ static int mmc_spi_response_get(struct mmc_spi_host *host,
 	u8 	leftover = 0;
 	unsigned short rotator;
 	int 	i;
-	char	tag[32];
+	char	tag[43];
 
 	snprintf(tag, sizeof(tag), "  ... CMD%d response SPI_%s",
 		cmd->opcode, maptype(cmd));
-- 
2.43.0