| Message ID | 1696007448-42127-1-git-send-email-lizhi.hou@amd.com (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | [v3] PCI: of_property: Fix uninitialized variable when of_irq_parse_raw() failed | expand |
On Fri, Sep 29, 2023 at 10:10:48AM -0700, Lizhi Hou wrote: > In function of_pci_prop_intr_map(), addr_sz[i] will be uninitialized if > of_irq_parse_raw() returns failure. Add addr_sz array initialization. And > when parsing irq failed, skip generating interrupt-map pair for the pin. > > Fixes: 407d1a51921e ("PCI: Create device tree node for bridge") > Reported-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com> > Closes: https://lore.kernel.org/all/20230911154856.000076c3@Huawei.com/ > Reviewed-by: Herve Codina <herve.codina@bootlin.com> > Signed-off-by: Lizhi Hou <lizhi.hou@amd.com> Applied to for-linus for v6.6, since 407d1a51921e appeared in v6.6-rc1. I added Herve's Reported-by since he reported this as well as the cset leak at https://lore.kernel.org/all/20230911171319.495bb837@bootlin.com/ > --- > drivers/pci/of_property.c | 25 ++++++++++++++++++------- > 1 file changed, 18 insertions(+), 7 deletions(-) > > diff --git a/drivers/pci/of_property.c b/drivers/pci/of_property.c > index 710ec35ba4a1..c2c7334152bc 100644 > --- a/drivers/pci/of_property.c > +++ b/drivers/pci/of_property.c > @@ -186,8 +186,8 @@ static int of_pci_prop_interrupts(struct pci_dev *pdev, > static int of_pci_prop_intr_map(struct pci_dev *pdev, struct of_changeset *ocs, > struct device_node *np) > { > + u32 i, addr_sz[OF_PCI_MAX_INT_PIN] = { 0 }, map_sz = 0; > struct of_phandle_args out_irq[OF_PCI_MAX_INT_PIN]; > - u32 i, addr_sz[OF_PCI_MAX_INT_PIN], map_sz = 0; > __be32 laddr[OF_PCI_ADDRESS_CELLS] = { 0 }; > u32 int_map_mask[] = { 0xffff00, 0, 0, 7 }; > struct device_node *pnode; > @@ -213,33 +213,44 @@ static int of_pci_prop_intr_map(struct pci_dev *pdev, struct of_changeset *ocs, > out_irq[i].args[0] = pin; > ret = of_irq_parse_raw(laddr, &out_irq[i]); > if (ret) { > - pci_err(pdev, "parse irq %d failed, ret %d", pin, ret); > + out_irq[i].np = NULL; > + pci_dbg(pdev, "parse irq %d failed, ret %d", pin, ret); > continue; > } > - ret = of_property_read_u32(out_irq[i].np, "#address-cells", > - &addr_sz[i]); > - if (ret) > - addr_sz[i] = 0; > + of_property_read_u32(out_irq[i].np, "#address-cells", > + &addr_sz[i]); > } > > list_for_each_entry(child, &pdev->subordinate->devices, bus_list) { > for (pin = 1; pin <= OF_PCI_MAX_INT_PIN; pin++) { > i = pci_swizzle_interrupt_pin(child, pin) - 1; > + if (!out_irq[i].np) > + continue; > map_sz += 5 + addr_sz[i] + out_irq[i].args_count; > } > } > > + /* > + * Parsing interrupt failed for all pins. In this case, it does not > + * need to generate interrupt-map property. > + */ > + if (!map_sz) > + return 0; > + > int_map = kcalloc(map_sz, sizeof(u32), GFP_KERNEL); > mapp = int_map; > > list_for_each_entry(child, &pdev->subordinate->devices, bus_list) { > for (pin = 1; pin <= OF_PCI_MAX_INT_PIN; pin++) { > + i = pci_swizzle_interrupt_pin(child, pin) - 1; > + if (!out_irq[i].np) > + continue; > + > *mapp = (child->bus->number << 16) | > (child->devfn << 8); > mapp += OF_PCI_ADDRESS_CELLS; > *mapp = pin; > mapp++; > - i = pci_swizzle_interrupt_pin(child, pin) - 1; > *mapp = out_irq[i].np->phandle; > mapp++; > if (addr_sz[i]) { > -- > 2.34.1 >
diff --git a/drivers/pci/of_property.c b/drivers/pci/of_property.c index 710ec35ba4a1..c2c7334152bc 100644 --- a/drivers/pci/of_property.c +++ b/drivers/pci/of_property.c @@ -186,8 +186,8 @@ static int of_pci_prop_interrupts(struct pci_dev *pdev, static int of_pci_prop_intr_map(struct pci_dev *pdev, struct of_changeset *ocs, struct device_node *np) { + u32 i, addr_sz[OF_PCI_MAX_INT_PIN] = { 0 }, map_sz = 0; struct of_phandle_args out_irq[OF_PCI_MAX_INT_PIN]; - u32 i, addr_sz[OF_PCI_MAX_INT_PIN], map_sz = 0; __be32 laddr[OF_PCI_ADDRESS_CELLS] = { 0 }; u32 int_map_mask[] = { 0xffff00, 0, 0, 7 }; struct device_node *pnode; @@ -213,33 +213,44 @@ static int of_pci_prop_intr_map(struct pci_dev *pdev, struct of_changeset *ocs, out_irq[i].args[0] = pin; ret = of_irq_parse_raw(laddr, &out_irq[i]); if (ret) { - pci_err(pdev, "parse irq %d failed, ret %d", pin, ret); + out_irq[i].np = NULL; + pci_dbg(pdev, "parse irq %d failed, ret %d", pin, ret); continue; } - ret = of_property_read_u32(out_irq[i].np, "#address-cells", - &addr_sz[i]); - if (ret) - addr_sz[i] = 0; + of_property_read_u32(out_irq[i].np, "#address-cells", + &addr_sz[i]); } list_for_each_entry(child, &pdev->subordinate->devices, bus_list) { for (pin = 1; pin <= OF_PCI_MAX_INT_PIN; pin++) { i = pci_swizzle_interrupt_pin(child, pin) - 1; + if (!out_irq[i].np) + continue; map_sz += 5 + addr_sz[i] + out_irq[i].args_count; } } + /* + * Parsing interrupt failed for all pins. In this case, it does not + * need to generate interrupt-map property. + */ + if (!map_sz) + return 0; + int_map = kcalloc(map_sz, sizeof(u32), GFP_KERNEL); mapp = int_map; list_for_each_entry(child, &pdev->subordinate->devices, bus_list) { for (pin = 1; pin <= OF_PCI_MAX_INT_PIN; pin++) { + i = pci_swizzle_interrupt_pin(child, pin) - 1; + if (!out_irq[i].np) + continue; + *mapp = (child->bus->number << 16) | (child->devfn << 8); mapp += OF_PCI_ADDRESS_CELLS; *mapp = pin; mapp++; - i = pci_swizzle_interrupt_pin(child, pin) - 1; *mapp = out_irq[i].np->phandle; mapp++; if (addr_sz[i]) {
In function of_pci_prop_intr_map(), addr_sz[i] will be uninitialized if of_irq_parse_raw() returns failure. Add addr_sz array initialization. And when parsing irq failed, skip generating interrupt-map pair for the pin. Fixes: 407d1a51921e ("PCI: Create device tree node for bridge") Reported-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com> Closes: https://lore.kernel.org/all/20230911154856.000076c3@Huawei.com/ Reviewed-by: Herve Codina <herve.codina@bootlin.com> Signed-off-by: Lizhi Hou <lizhi.hou@amd.com> --- drivers/pci/of_property.c | 25 ++++++++++++++++++------- 1 file changed, 18 insertions(+), 7 deletions(-)