6.6-stable review patch. If anyone has any objections, please let me know.
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From: Alexandra Diupina adiupina@astralinux.ru
[ 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: b22dbbb24571 ("PCI: kirin: Support PERST# GPIOs for HiKey970 external PEX 8606 bridge") Link: https://lore.kernel.org/linux-pci/20240903115823.30647-1-adiupina@astralinux... 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 --- drivers/pci/controller/dwc/pcie-kirin.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c index 2ee146767971c..421697ec7591d 100644 --- a/drivers/pci/controller/dwc/pcie-kirin.c +++ b/drivers/pci/controller/dwc/pcie-kirin.c @@ -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) {