From 0419056ec8fd01ddf5460d2dba0491aad22657dd Mon Sep 17 00:00:00 2001
From: Anton Vasilyev <vasilyev@ispras.ru>
Date: Fri, 27 Jul 2018 16:39:31 +0300
Subject: [PATCH] tty: rocket: Fix possible buffer overwrite on register_PCI
Git-commit: 0419056ec8fd01ddf5460d2dba0491aad22657dd
Patch-mainline: v4.19-rc1
References: bsc#1051510
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@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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