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PCI: kirin: Fix buffer overflow in kirin_pcie_parse_port()

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[ Upstream commit c500a86693a126c9393e602741e348f80f1b0fc5 ]

Within kirin_pcie_parse_port(), the pcie->num_slots is compared to
pcie->gpio_id_reset size (MAX_PCI_SLOTS) which is correct and would lead
to an overflow.

Thus, fix condition to pcie->num_slots + 1 >= MAX_PCI_SLOTS and move
pcie->num_slots increment below the if-statement to avoid out-of-bounds
array access.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: b22dbbb245 ("PCI: kirin: Support PERST# GPIOs for HiKey970 external PEX 8606 bridge")
Link: https://lore.kernel.org/linux-pci/20240903115823.30647-1-adiupina@astralinux.ru
Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
[kwilczynski: commit log]
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexandra Diupina
2024-09-03 14:58:23 +03:00
committed by Greg Kroah-Hartman
parent d08754be99
commit 95248d7497
1 changed files with 2 additions and 2 deletions
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4
drivers/pci/controller/dwc/pcie-kirin.c
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@@ -415,12 +415,12 @@ static int kirin_pcie_parse_port(struct kirin_pcie *pcie,
if (pcie->gpio_id_reset[i] < 0)
continue;
pcie->num_slots++;
if (pcie->num_slots > MAX_PCI_SLOTS) {
if (pcie->num_slots + 1 >= MAX_PCI_SLOTS) {
dev_err(dev, "Too many PCI slots!\n");
ret = -EINVAL;
goto put_node;
}
pcie->num_slots++;
ret = of_pci_get_devfn(child);
if (ret < 0) {