linux-kernel - [PATCH 4.14 20/64] ALSA: emu10k1: fix possible info leak to userspace on SNDRV_EMU10K1_IOCTL

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Date:   Thu, 27 Sep 2018 11:03:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Willy Tarreau <w@....eu>,
        Jann Horn <jannh@...gle.com>, Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.14 20/64] ALSA: emu10k1: fix possible info leak to userspace on SNDRV_EMU10K1_IOCTL_INFO

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Willy Tarreau <w@....eu>

commit 49434c6c575d2008c0abbc93e615019f39e01252 upstream.

snd_emu10k1_fx8010_ioctl(SNDRV_EMU10K1_IOCTL_INFO) allocates
memory using kmalloc() and partially fills it by calling
snd_emu10k1_fx8010_info() before returning the resulting
structure to userspace, leaving uninitialized holes. Let's
just use kzalloc() here.

BugLink: http://blog.infosectcbr.com.au/2018/09/linux-kernel-infoleaks.html
Signed-off-by: Willy Tarreau <w@....eu>
Cc: Jann Horn <jannh@...gle.com>
Cc: <stable@...r.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/pci/emu10k1/emufx.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/pci/emu10k1/emufx.c
+++ b/sound/pci/emu10k1/emufx.c
@@ -2547,7 +2547,7 @@ static int snd_emu10k1_fx8010_ioctl(stru
 		emu->support_tlv = 1;
 		return put_user(SNDRV_EMU10K1_VERSION, (int __user *)argp);
 	case SNDRV_EMU10K1_IOCTL_INFO:
-		info = kmalloc(sizeof(*info), GFP_KERNEL);
+		info = kzalloc(sizeof(*info), GFP_KERNEL);
 		if (!info)
 			return -ENOMEM;
 		snd_emu10k1_fx8010_info(emu, info);