From 003d3e70dbebe9d99387f2eeda405b1950b808f2 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Tue, 18 Jul 2017 13:48:06 +0200 Subject: [PATCH] ALSA: ad1848: fix format string overflow warning The snd_pcm name is too long to fit into the card shortname or a part of the longname: sound/isa/ad1848/ad1848.c: In function 'snd_ad1848_probe': sound/isa/ad1848/ad1848.c:116:26: error: ' at 0x' directive writing 6 bytes into a region of size between 1 and 80 [-Werror=format-overflow=] sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d", ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ sound/isa/ad1848/ad1848.c:116:2: note: 'sprintf' output between 22 and 128 bytes into a destination of size 80 sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d", ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ chip->pcm->name, chip->port, irq[n], dma1[n]); ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This changes the code to use length-checking functions that truncate if necessary. The "[Thinkpad]" substring is now also part of the snprintf(), as that could also overflow the buffer. Signed-off-by: Arnd Bergmann Signed-off-by: Takashi Iwai --- sound/isa/ad1848/ad1848.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) diff --git a/sound/isa/ad1848/ad1848.c b/sound/isa/ad1848/ad1848.c index e739b1c85c25..7c8e92f62f3b 100644 --- a/sound/isa/ad1848/ad1848.c +++ b/sound/isa/ad1848/ad1848.c @@ -110,13 +110,17 @@ static int snd_ad1848_probe(struct device *dev, unsigned int n) if (error < 0) goto out; - strcpy(card->driver, "AD1848"); - strcpy(card->shortname, chip->pcm->name); - - sprintf(card->longname, "%s at 0x%lx, irq %d, dma %d", - chip->pcm->name, chip->port, irq[n], dma1[n]); - if (thinkpad[n]) - strcat(card->longname, " [Thinkpad]"); + strlcpy(card->driver, "AD1848", sizeof(card->driver)); + strlcpy(card->shortname, chip->pcm->name, sizeof(card->shortname)); + + if (!thinkpad[n]) + snprintf(card->longname, sizeof(card->longname), + "%s at 0x%lx, irq %d, dma %d", + chip->pcm->name, chip->port, irq[n], dma1[n]); + else + snprintf(card->longname, sizeof(card->longname), + "%s at 0x%lx, irq %d, dma %d [Thinkpad]", + chip->pcm->name, chip->port, irq[n], dma1[n]); error = snd_card_register(card); if (error < 0) -- 2.20.1