linux-kernel - [PATCH 5.15 37/83] media: v4l2-compat-ioctl32.c: zero buffer passed to v4l2_compat_get_array

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Message-Id: <20221003070722.926248909@linuxfoundation.org>
Date:   Mon,  3 Oct 2022 09:11:02 +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, Hans Verkuil <hverkuil-cisco@...all.nl>,
        syzbot+ff18193ff05f3f87f226@...kaller.appspotmail.com,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Subject: [PATCH 5.15 37/83] media: v4l2-compat-ioctl32.c: zero buffer passed to v4l2_compat_get_array_args()

From: Hans Verkuil <hverkuil-cisco@...all.nl>

commit 4e768c8e34e639cff66a0f175bc4aebf472e4305 upstream.

The v4l2_compat_get_array_args() function can leave uninitialized memory in the
buffer it is passed. So zero it before copying array elements from userspace
into the buffer.

Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Reported-by: syzbot+ff18193ff05f3f87f226@...kaller.appspotmail.com
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/media/v4l2-core/v4l2-compat-ioctl32.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
+++ b/drivers/media/v4l2-core/v4l2-compat-ioctl32.c
@@ -1033,6 +1033,8 @@ int v4l2_compat_get_array_args(struct fi
 {
 	int err = 0;
 
+	memset(mbuf, 0, array_size);
+
 	switch (cmd) {
 	case VIDIOC_G_FMT32:
 	case VIDIOC_S_FMT32: