[PATCH] pci: Handle failed calloc in decode_regions()

[sean at geanix.com]

Quoting Pierre-Clément Tosi <ptosi at google.com>:

> Add a check for calloc() failing to allocate the requested memory.
>
> Make decode_regions() return an error code.
>
> Cc: Bin Meng <bmeng.cn at gmail.com>
> Cc: Simon Glass <sjg at chromium.org>
> Cc: Stefan Roese <sr at denx.de>
> Signed-off-by: Pierre-Clément Tosi <ptosi at google.com>
> ---

Hi,

We upgraded from v2022.04 -> v2022.10, and this PATCH breaks PCI  
(scsi/sata) support for x86_64.
I have seen this in qemu, i havn't had the time to test this on real hardware.

Steps to reproduce:
$ make efi-x86_payload64_defconfig && make -j32 && scripts/build-efi.sh -sPrp

Br,
/Sean

>  drivers/pci/pci-uclass.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/pci/pci-uclass.c b/drivers/pci/pci-uclass.c
> index 970ee1adf1..2c85e78a13 100644
> --- a/drivers/pci/pci-uclass.c
> +++ b/drivers/pci/pci-uclass.c
> @@ -954,7 +954,7 @@ int pci_bind_bus_devices(struct udevice *bus)
>  	return 0;
>  }
>
> -static void decode_regions(struct pci_controller *hose, ofnode parent_node,
> +static int decode_regions(struct pci_controller *hose, ofnode parent_node,
>  			   ofnode node)
>  {
>  	int pci_addr_cells, addr_cells, size_cells;
> @@ -968,7 +968,7 @@ static void decode_regions(struct pci_controller  
> *hose, ofnode parent_node,
>  	prop = ofnode_get_property(node, "ranges", &len);
>  	if (!prop) {
>  		debug("%s: Cannot decode regions\n", __func__);
> -		return;
> +		return -EINVAL;
>  	}
>
>  	pci_addr_cells = ofnode_read_simple_addr_cells(node);
> @@ -986,6 +986,8 @@ static void decode_regions(struct pci_controller  
> *hose, ofnode parent_node,
>  	max_regions = len / cells_per_record + CONFIG_NR_DRAM_BANKS;
>  	hose->regions = (struct pci_region *)
>  		calloc(1, max_regions * sizeof(struct pci_region));
> +	if (!hose->regions)
> +		return -ENOMEM;
>
>  	for (i = 0; i < max_regions; i++, len -= cells_per_record) {
>  		u64 pci_addr, addr, size;
> @@ -1053,7 +1055,7 @@ static void decode_regions(struct  
> pci_controller *hose, ofnode parent_node,
>  	/* Add a region for our local memory */
>  	bd = gd->bd;
>  	if (!bd)
> -		return;
> +		return 0;
>
>  	for (i = 0; i < CONFIG_NR_DRAM_BANKS; ++i) {
>  		if (bd->bi_dram[i].size) {
> @@ -1068,7 +1070,7 @@ static void decode_regions(struct  
> pci_controller *hose, ofnode parent_node,
>  		}
>  	}
>
> -	return;
> +	return 0;
>  }
>
>  static int pci_uclass_pre_probe(struct udevice *bus)
> @@ -1097,7 +1099,10 @@ static int pci_uclass_pre_probe(struct udevice *bus)
>  	/* For bridges, use the top-level PCI controller */
>  	if (!device_is_on_pci_bus(bus)) {
>  		hose->ctlr = bus;
> -		decode_regions(hose, dev_ofnode(bus->parent), dev_ofnode(bus));
> +		ret = decode_regions(hose, dev_ofnode(bus->parent),
> +				     dev_ofnode(bus));
> +		if (ret)
> +			return ret;
>  	} else {
>  		struct pci_controller *parent_hose;
>
> --
> 2.36.1.124.g0e6072fb45-goog