linux-kernel - [PATCH v4] drivers/misc/vmw_vmci: restrict too big queue size in qp_host_alloc

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Date:   Tue,  9 Feb 2021 16:26:12 +0600
From:   Sabyrzhan Tasbolatov <snovitoll@...il.com>
To:     gregkh@...uxfoundation.org
Cc:     alex.dewar90@...il.com, arnd@...db.de,
        linux-kernel@...r.kernel.org, snovitoll@...il.com,
        syzbot+15ec7391f3d6a1a7cc7d@...kaller.appspotmail.com
Subject: [PATCH v4] drivers/misc/vmw_vmci: restrict too big queue size in qp_host_alloc_queue

syzbot found WARNING in qp_broker_alloc[1] in qp_host_alloc_queue()
when num_pages is 0x100001, giving queue_size + queue_page_size
bigger than KMALLOC_MAX_SIZE for kzalloc(), resulting order >= MAX_ORDER
condition.

queue_size + queue_page_size=0x8000d8, where KMALLOC_MAX_SIZE=0x400000.

[1]
Call Trace:
 alloc_pages include/linux/gfp.h:547 [inline]
 kmalloc_order+0x40/0x130 mm/slab_common.c:837
 kmalloc_order_trace+0x15/0x70 mm/slab_common.c:853
 kmalloc_large include/linux/slab.h:481 [inline]
 __kmalloc+0x257/0x330 mm/slub.c:3959
 kmalloc include/linux/slab.h:557 [inline]
 kzalloc include/linux/slab.h:682 [inline]
 qp_host_alloc_queue drivers/misc/vmw_vmci/vmci_queue_pair.c:540 [inline]
 qp_broker_create drivers/misc/vmw_vmci/vmci_queue_pair.c:1351 [inline]
 qp_broker_alloc+0x936/0x2740 drivers/misc/vmw_vmci/vmci_queue_pair.c:1739

Reported-by: syzbot+15ec7391f3d6a1a7cc7d@...kaller.appspotmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@...il.com>
---
> This patch does not apply to the tree...
Apologies, it was so stupid from my side.
Tested locally and via syzbot.

v4: made a patch based on commit 65f0d2414b("Merge tag 'sound-5.11-rc4'
of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound")
---
 drivers/misc/vmw_vmci/vmci_queue_pair.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/misc/vmw_vmci/vmci_queue_pair.c b/drivers/misc/vmw_vmci/vmci_queue_pair.c
index c49065887e8f..024dcdbd9d01 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -537,6 +537,9 @@ static struct vmci_queue *qp_host_alloc_queue(u64 size)
 
 	queue_page_size = num_pages * sizeof(*queue->kernel_if->u.h.page);
 
+	if (queue_size + queue_page_size > KMALLOC_MAX_SIZE)
+		return NULL;
+
 	queue = kzalloc(queue_size + queue_page_size, GFP_KERNEL);
 	if (queue) {
 		queue->q_header = NULL;
-- 
2.25.1