From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Sat, 30 Sep 2017 08:16:51 +0000 (+0300)
Subject: misc: pci_endpoint_test: Avoid triggering a BUG()
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=95e8d653ea987adfe108173bd5969201a363bf19;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

misc: pci_endpoint_test: Avoid triggering a BUG()


[ Upstream commit 846df244ebefbc9f7b91e9ae7a5e5a2e69fb4772 ]

If you call ida_simple_remove(&pci_endpoint_test_ida, id) with a
negative "id" then it triggers an immediate BUG_ON().  Let's not allow
that.

Fixes: 2c156ac71c6b ("misc: Add host side PCI driver for PCI test function device")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index e787a63a321a..e089bb6dde3a 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -590,6 +590,8 @@ static void pci_endpoint_test_remove(struct pci_dev *pdev)
 
 	if (sscanf(misc_device->name, DRV_MODULE_NAME ".%d", &id) != 1)
 		return;
+	if (id < 0)
+		return;
 
 	misc_deregister(&test->miscdev);
 	ida_simple_remove(&pci_endpoint_test_ida, id);