From 2fd10bcf0310b9525b2af9e1f7aa9ddd87c3772e Mon Sep 17 00:00:00 2001
From: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Date: Tue, 9 Feb 2021 16:26:12 +0600
Subject: [PATCH] drivers/misc/vmw_vmci: restrict too big queue size in qp_host_alloc_queue
Git-commit: 2fd10bcf0310b9525b2af9e1f7aa9ddd87c3772e
Patch-mainline: v5.12-rc1
References: git-fixes
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@syzkaller.appspotmail.com
Signed-off-by: Sabyrzhan Tasbolatov <snovitoll@gmail.com>
Link: https://lore.kernel.org/r/20210209102612.2112247-1-snovitoll@gmail.com
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 d787ddecee77..880c33ab9f47 100644
--- a/drivers/misc/vmw_vmci/vmci_queue_pair.c
+++ b/drivers/misc/vmw_vmci/vmci_queue_pair.c
@@ -539,6 +539,9 @@ 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;
--
2.26.2