ALSA: rawmidi: Initialize allocated buffers
commit 5a7b44a8df822e0667fc76ed7130252523993bda upstream.
syzbot reported the uninitialized value exposure in certain situations
using virmidi loop. It's likely a very small race at writing and
reading, and the influence is almost negligible. But it's safer to
paper over this just by replacing the existing kvmalloc() with
kvzalloc().
Reported-by: syzbot+194dffdb8b22fc5d207a@syzkaller.appspotmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Change-Id: Ife8f63ec1c583a7723b5b62425ed12fce2159595
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index b77a735..820bc36 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -135,7 +135,7 @@
runtime->avail = 0;
else
runtime->avail = runtime->buffer_size;
- if ((runtime->buffer = kmalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
+ if ((runtime->buffer = kzalloc(runtime->buffer_size, GFP_KERNEL)) == NULL) {
kfree(runtime);
return -ENOMEM;
}
@@ -669,7 +669,7 @@
return -EINVAL;
}
if (params->buffer_size != runtime->buffer_size) {
- newbuf = kmalloc(params->buffer_size, GFP_KERNEL);
+ newbuf = kzalloc(params->buffer_size, GFP_KERNEL);
if (!newbuf)
return -ENOMEM;
spin_lock_irq(&runtime->lock);
