diff options
| author |   Takashi Iwai <tiwai@suse.de> | 2020-02-18 10:14:09 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2020-02-18 10:15:41 +0100 |
| commit | 44eeb081b8630bb3ad3cd381d1ae1831463e48bb (patch) | |
| tree | 22799f2d7d68e9a71bca72600a38af044232e299 /sound/pci/hda/hda_sysfs.c | |
| parent | ALSA: hda/realtek - Apply quirk for yet another MSI laptop (diff) | |
| download | linux-dev-44eeb081b8630bb3ad3cd381d1ae1831463e48bb.tar.xz linux-dev-44eeb081b8630bb3ad3cd381d1ae1831463e48bb.zip | |
ALSA: hda: Use scnprintf() for printing texts for sysfs/procfs
Some code in HD-audio driver calls snprintf() in a loop and still
expects that the return value were actually written size, while
snprintf() returns the expected would-be length instead. When the
given buffer limit were small, this leads to a buffer overflow.
Use scnprintf() for addressing those issues. It returns the actually
written size unlike snprintf().
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200218091409.27162-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to '')
| -rw-r--r-- | sound/pci/hda/hda_sysfs.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/sound/pci/hda/hda_sysfs.c b/sound/pci/hda/hda_sysfs.c index 0607ed5d1959..eb8ec109d7ad 100644 --- a/sound/pci/hda/hda_sysfs.c +++ b/sound/pci/hda/hda_sysfs.c @@ -222,7 +222,7 @@ static ssize_t init_verbs_show(struct device *dev, int i, len = 0; mutex_lock(&codec->user_mutex); snd_array_for_each(&codec->init_verbs, i, v) { - len += snprintf(buf + len, PAGE_SIZE - len, + len += scnprintf(buf + len, PAGE_SIZE - len, "0x%02x 0x%03x 0x%04x\n", v->nid, v->verb, v->param); } @@ -272,7 +272,7 @@ static ssize_t hints_show(struct device *dev, int i, len = 0; mutex_lock(&codec->user_mutex); snd_array_for_each(&codec->hints, i, hint) { - len += snprintf(buf + len, PAGE_SIZE - len, + len += scnprintf(buf + len, PAGE_SIZE - len, "%s = %s\n", hint->key, hint->val); } mutex_unlock(&codec->user_mutex); |