Re: [PATCH v2] PCI: kirin: Fix buffer overflow

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just a friendly reminder


19/07/24 15:21, Alexandra Diupina пишет:
In kirin_pcie_parse_port() pcie->num_slots is compared to
pcie->gpio_id_reset size (MAX_PCI_SLOTS). Need to fix
condition to pcie->num_slots + 1 >= MAX_PCI_SLOTS and move
pcie->num_slots increment lower 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")
Signed-off-by: Alexandra Diupina <adiupina@xxxxxxxxxxxxx>
---
v2: some changes
  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 d5523f302102..deab1e653b9a 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -412,12 +412,12 @@ 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) {





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