From 3a5a8a27545ddd8bbdcc9241230a2eed4e81c931 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Wed, 11 Mar 2020 08:16:06 +0100 Subject: [PATCH] dmaengine: ppc4xx: Use scnprintf() for avoiding potential buffer overflow 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 Link: https://lore.kernel.org/r/20200311071606.4485-1-tiwai@suse.de Signed-off-by: Vinod Koul --- 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]]); } -- 2.20.1