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| author | Arnd Bergmann <arnd@arndb.de> | 2017-07-18 13:48:06 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2017-07-18 17:52:24 +0200 |
| commit | 003d3e70dbebe9d99387f2eeda405b1950b808f2 (patch) | |
| tree | 2fa3ec340fbb4a2f5e49a37bca28ac2fe097581c | |
| parent | 6d8b04de87e1d736dad0ce7079e0ea112ab160c3 (diff) | |
| download | linux-003d3e70dbebe9d99387f2eeda405b1950b808f2.tar.bz2 | |
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 <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
| -rw-r--r-- | sound/isa/ad1848/ad1848.c | 18 |
1 files 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) |