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uio_hv_generic: Fix kernel NULL pointer dereference in hv_uio_rescind 

ANBZ: #11150

commit 1d8e020e51ab07e40f9dd00b52f1da7d96fec04c stable.

commit fb1adbd7e5 upstream.

For primary VM Bus channels, primary_channel pointer is always NULL. This
pointer is valid only for the secondary channels. Also, rescind callback
is meant for primary channels only.

Fix NULL pointer dereference by retrieving the device_obj from the parent
for the primary channel.

Cc: stable@vger.kernel.org
Fixes: ca3cda6fcf ("uio_hv_generic: add rescind support")
Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
Signed-off-by: Naman Jain <namjain@linux.microsoft.com>
Link: https://lore.kernel.org/r/20240829071312.1595-2-namjain@linux.microsoft.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Fixes: CVE-2024-46739
Signed-off-by: Xiao Long <xiaolong@openanolis.org>
Signed-off-by: Ferry Meng <mengferry@linux.alibaba.com>
Reviewed-by: Guixin Liu <kanie@linux.alibaba.com>
Link: https://gitee.com/anolis/cloud-kernel/pulls/3890
This commit is contained in:
Saurabh Sengar 2024-08-29 15:13:11 +08:00 committed by 小龙
parent 90afa70829
commit 6df2dad93a
1 changed files with 2 additions and 1 deletions
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3
drivers/uio/uio_hv_generic.c
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@ -104,10 +104,11 @@ static void hv_uio_channel_cb(void *context)
/*
* Callback from vmbus_event when channel is rescinded.
* It is meant for rescind of primary channels only.
*/
static void hv_uio_rescind(struct vmbus_channel *channel)
{
struct hv_device *hv_dev = channel->primary_channel->device_obj;
struct hv_device *hv_dev = channel->device_obj;
struct hv_uio_private_data *pdata = hv_get_drvdata(hv_dev);
/*