diff options
| author | Takashi Iwai <tiwai@suse.de> | 2018-11-09 11:59:45 +0100 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2018-11-09 14:12:04 +0100 |
| commit | 65766ee0bf7fe8b3be80e2e1c3ef54ad59b29476 (patch) | |
| tree | 623d81067b0f9179871d1d64040faadffb4ec7ff /sound/core/oss/pcm_plugin.c | |
| parent | 5e93a125f521efd00d71af31c2a301f3d46af48c (diff) | |
ALSA: oss: Use kvzalloc() for local buffer allocations
PCM OSS layer may allocate a few temporary buffers, one for the core
read/write and another for the conversions via plugins. Currently
both are allocated via vmalloc(). But as the allocation size is
equivalent with the PCM period size, the required size might be quite
small, depending on the application.
This patch replaces these vmalloc() calls with kvzalloc() for covering
small period sizes better. Also, we use "z"-alloc variant here for
addressing the possible uninitialized access reported by syzkaller.
Reported-by: syzbot+1cb36954e127c98dd037@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/core/oss/pcm_plugin.c')
| -rw-r--r-- | sound/core/oss/pcm_plugin.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/sound/core/oss/pcm_plugin.c b/sound/core/oss/pcm_plugin.c index 141c5f3a9575..31cb2acf8afc 100644 --- a/sound/core/oss/pcm_plugin.c +++ b/sound/core/oss/pcm_plugin.c @@ -66,8 +66,8 @@ static int snd_pcm_plugin_alloc(struct snd_pcm_plugin *plugin, snd_pcm_uframes_t return -ENXIO; size /= 8; if (plugin->buf_frames < frames) { - vfree(plugin->buf); - plugin->buf = vmalloc(size); + kvfree(plugin->buf); + plugin->buf = kvzalloc(size, GFP_KERNEL); plugin->buf_frames = frames; } if (!plugin->buf) { @@ -191,7 +191,7 @@ int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin) if (plugin->private_free) plugin->private_free(plugin); kfree(plugin->buf_channels); - vfree(plugin->buf); + kvfree(plugin->buf); kfree(plugin); return 0; } |