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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@ispras.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Vasilyev 2018-07-27 16:39:31 +03:00 committed by Greg Kroah-Hartman
parent 784c29eda5
commit 0419056ec8
1 changed files with 1 additions and 1 deletions
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2
drivers/tty/rocket.c
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@ -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);