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Message-ID: <aIzCYdH9dOMDag5i@stanley.mountain>
Date: Fri, 1 Aug 2025 16:34:25 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Frank Li <Frank.Li@....com>
Cc: Manivannan Sadhasivam <mani@...nel.org>,
	Krzysztof WilczyƄski <kwilczynski@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH next] misc: pci_endpoint_test: Fix array underflow in
 pci_endpoint_test_ioctl()

We recently added NO_BAR (-1) to the pci_barno enum which, in practical
terms, changes the enum from an unsigned int to a signed int.  If the
user passes a negative number in pci_endpoint_test_ioctl() then it
results in an array underflow in pci_endpoint_test_bar().

Fixes: eefb83790a0d ("misc: pci_endpoint_test: Add doorbell test case")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
---
 drivers/misc/pci_endpoint_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/pci_endpoint_test.c b/drivers/misc/pci_endpoint_test.c
index 1c156a3f845e..f935175d8bf5 100644
--- a/drivers/misc/pci_endpoint_test.c
+++ b/drivers/misc/pci_endpoint_test.c
@@ -937,7 +937,7 @@ static long pci_endpoint_test_ioctl(struct file *file, unsigned int cmd,
 	switch (cmd) {
 	case PCITEST_BAR:
 		bar = arg;
-		if (bar > BAR_5)
+		if (bar <= NO_BAR || bar > BAR_5)
 			goto ret;
 		if (is_am654_pci_dev(pdev) && bar == BAR_0)
 			goto ret;
-- 
2.47.2


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