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| author | Arnd Bergmann <arnd@arndb.de> | 2020-03-25 13:28:41 +0100 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2020-03-25 13:28:42 +0100 |
| commit | 5fc0458767461bd53b4a74fc003e6175aa853a46 (patch) | |
| tree | 35a88c69de101e3c18a0285ddce6a7c051465e28 /drivers/bus | |
| parent | 1822d610c5a7581d1bce457e9cdfc0fdce0eda1a (diff) | |
| parent | a6dd255bdd7d00bbdbf78ba00bde9fc64f86c3a7 (diff) | |
| download | linux-5fc0458767461bd53b4a74fc003e6175aa853a46.tar.bz2 | |
Merge tag 'hisi-drivers-for-5.7' of git://github.com/hisilicon/linux-hisi into arm/drivers
ARM64: hisi: SoC driver updates for 5.7
- Fix up the device resources for the broken firmware to avoid
use-after-free warnings from KASAN in the host removal path
* tag 'hisi-drivers-for-5.7' of git://github.com/hisilicon/linux-hisi:
bus: hisi_lpc: Fixup IO ports addresses to avoid use-after-free in host removal
Link: https://lore.kernel.org/r/5E61F700.5060301@hisilicon.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'drivers/bus')
| -rw-r--r-- | drivers/bus/hisi_lpc.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c index 8101df901830..378f5d62a991 100644 --- a/drivers/bus/hisi_lpc.c +++ b/drivers/bus/hisi_lpc.c @@ -358,6 +358,26 @@ static int hisi_lpc_acpi_xlat_io_res(struct acpi_device *adev, } /* + * Released firmware describes the IO port max address as 0x3fff, which is + * the max host bus address. Fixup to a proper range. This will probably + * never be fixed in firmware. + */ +static void hisi_lpc_acpi_fixup_child_resource(struct device *hostdev, + struct resource *r) +{ + if (r->end != 0x3fff) + return; + + if (r->start == 0xe4) + r->end = 0xe4 + 0x04 - 1; + else if (r->start == 0x2f8) + r->end = 0x2f8 + 0x08 - 1; + else + dev_warn(hostdev, "unrecognised resource %pR to fixup, ignoring\n", + r); +} + +/* * hisi_lpc_acpi_set_io_res - set the resources for a child * @child: the device node to be updated the I/O resource * @hostdev: the device node associated with host controller @@ -418,8 +438,11 @@ static int hisi_lpc_acpi_set_io_res(struct device *child, return -ENOMEM; } count = 0; - list_for_each_entry(rentry, &resource_list, node) - resources[count++] = *rentry->res; + list_for_each_entry(rentry, &resource_list, node) { + resources[count] = *rentry->res; + hisi_lpc_acpi_fixup_child_resource(hostdev, &resources[count]); + count++; + } acpi_dev_free_resource_list(&resource_list); |