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| author | Hans de Goede <hdegoede@redhat.com> | 2021-01-15 22:57:52 +0100 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-01-20 19:20:20 +0100 |
| commit | 78a18fec5258c8df9435399a1ea022d73d3eceb9 (patch) | |
| tree | f25963c016fca7c8841887a7aed8eee8bb0c3286 /drivers/acpi | |
| parent | 19c329f6808995b142b3966301f217c831e7cf31 (diff) | |
| download | linux-78a18fec5258c8df9435399a1ea022d73d3eceb9.tar.gz | |
ACPI: scan: Make acpi_bus_get_device() clear return pointer on error
Set the acpi_device pointer which acpi_bus_get_device() returns-by-
reference to NULL on errors.
We've recently had 2 cases where callers of acpi_bus_get_device()
did not properly error check the return value, so set the returned-
by-reference acpi_device pointer to NULL, because at least some
callers of acpi_bus_get_device() expect that to be done on errors.
[ rjw: This issue was exposed by commit 71da201f38df ("ACPI: scan:
Defer enumeration of devices with _DEP lists") which caused it to
be much more likely to occur on some systems, but the real defect
had been introduced by an earlier commit. ]
Fixes: 40e7fcb19293 ("ACPI: Add _DEP support to fix battery issue on Asus T100TA")
Fixes: bcfcd409d4db ("usb: split code locating ACPI companion into port and device")
Reported-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Tested-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Diagnosed-by: Rafael J. Wysocki <rafael@kernel.org>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Cc: All applicable <stable@vger.kernel.org>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi')
| -rw-r--r-- | drivers/acpi/scan.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 58ff36340cd7..1db063b02f63 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -586,6 +586,8 @@ static int acpi_get_device_data(acpi_handle handle, struct acpi_device **device, if (!device) return -EINVAL; + *device = NULL; + status = acpi_get_data_full(handle, acpi_scan_drop_device, (void **)device, callback); if (ACPI_FAILURE(status) || !*device) { |