diff mbox series

[v1,2/2] PCI: of_property: Fix uninitialized variable when of_irq_parse_raw() failed

Message ID 1695919631-7661-2-git-send-email-lizhi.hou@amd.com
State New
Headers
Series [v1,1/2] PCI: of: Fix memory leak when of_changeset_create_node() failed |

Commit Message

Lizhi Hou Sept. 28, 2023, 4:47 p.m. UTC 
  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(-)

Comments

Bjorn Helgaas Sept. 29, 2023, 4:27 p.m. UTC | #1 
On Thu, Sep 28, 2023 at 09:47:11AM -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.

Would you mind splitting this into two?  It sounds like it fixes two
problems: (1) using uninitialized addr_sz[] and (2) skip generating
interrupt-map pair.

There's also something going on with the pci_swizzle_interrupt_pin()
change; maybe that should be a third patch so you can explain what's
going on there?

IIUC this is actually a *v2* (not a v1), since you posted it
previously as
https://lore.kernel.org/r/1694801287-17217-2-git-send-email-lizhi.hou@amd.com
so the next round should be labeled v3.

> 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(-)
> 
> 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
>
Lizhi Hou Sept. 29, 2023, 4:40 p.m. UTC | #2 
On 9/29/23 09:27, Bjorn Helgaas wrote:
> On Thu, Sep 28, 2023 at 09:47:11AM -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.
> Would you mind splitting this into two?  It sounds like it fixes two
> problems: (1) using uninitialized addr_sz[] and (2) skip generating
> interrupt-map pair.
Ok. I will split it into two patches and mark them 'v3'.
>
> There's also something going on with the pci_swizzle_interrupt_pin()
> change; maybe that should be a third patch so you can explain what's
> going on there?

It is all about to skip the pair which can not be parsed by 
of_irq_parse_raw().  pci_swizzle_interrupt_pin() is moved to the 
beginning of the loop to skip the non parsed pin.


Thanks,

Lizhi

>
> IIUC this is actually a *v2* (not a v1), since you posted it
> previously as
> https://lore.kernel.org/r/1694801287-17217-2-git-send-email-lizhi.hou@amd.com
> so the next round should be labeled v3.
>
>> 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(-)
>>
>> 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 mbox series

Patch

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]) {