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From: Takashi Iwai <tiwai@suse.de>
To: Vinod Koul <vkoul@kernel.org>
Cc: Dan Williams <dan.j.williams@intel.com>, dmaengine@vger.kernel.org
Subject: [PATCH] dmaengine: ppc4xx: Use scnprintf() for avoiding potential buffer overflow
Date: Wed, 11 Mar 2020 08:16:06 +0100	[thread overview]
Message-ID: <20200311071606.4485-1-tiwai@suse.de> (raw)

Since snprintf() returns the would-be-output size instead of the
actual output size, the succeeding calls may go beyond the given
buffer limit.  Fix it by replacing with scnprintf().

Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 drivers/dma/ppc4xx/adma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c
index fbabd2e88a18..4db000d5f01c 100644
--- a/drivers/dma/ppc4xx/adma.c
+++ b/drivers/dma/ppc4xx/adma.c
@@ -4303,7 +4303,7 @@ static ssize_t devices_show(struct device_driver *dev, char *buf)
 	for (i = 0; i < PPC440SPE_ADMA_ENGINES_NUM; i++) {
 		if (ppc440spe_adma_devices[i] == -1)
 			continue;
-		size += snprintf(buf + size, PAGE_SIZE - size,
+		size += scnprintf(buf + size, PAGE_SIZE - size,
 				 "PPC440SP(E)-ADMA.%d: %s\n", i,
 				 ppc_adma_errors[ppc440spe_adma_devices[i]]);
 	}
-- 
2.16.4


             reply	other threads:[~2020-03-11  7:16 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-11  7:16 Takashi Iwai [this message]
2020-03-11  9:40 ` [PATCH] dmaengine: ppc4xx: Use scnprintf() for avoiding potential buffer overflow Vinod Koul

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