linux-kernel - [PATCH] tty: rocket: Fix possible buffer overwrite on register

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Date:   Fri, 27 Jul 2018 16:39:31 +0300
From:   Anton Vasilyev <vasilyev@...ras.ru>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Anton Vasilyev <vasilyev@...ras.ru>, Jiri Slaby <jslaby@...e.com>,
        linux-kernel@...r.kernel.org, ldv-project@...uxtesting.org
Subject: [PATCH] tty: rocket: Fix possible buffer overwrite on register_PCI

If number of isa and pci boards exceed NUM_BOARDS on the path
rp_init()->init_PCI()->register_PCI() then buffer overwrite occurs
in register_PCI() on assign rcktpt_io_addr[i].

The patch adds check on upper bound for index of registered
board in register_PCI.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Anton Vasilyev <vasilyev@...ras.ru>
---
 drivers/tty/rocket.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index bdd17d2aaafd..b121d8f8f3d7 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1881,7 +1881,7 @@ static __init int register_PCI(int i, struct pci_dev *dev)
 	ByteIO_t UPCIRingInd = 0;
 
 	if (!dev || !pci_match_id(rocket_pci_ids, dev) ||
-	    pci_enable_device(dev))
+	    pci_enable_device(dev) || i >= NUM_BOARDS)
 		return 0;
 
 	rcktpt_io_addr[i] = pci_resource_start(dev, 0);
-- 
2.18.0