From: Barnabás Pőcze pobrn@protonmail.com
[ Upstream commit 1975718c488a39128f1f515b23ae61a5a214cc3d ]
Previously, `__query_block()` would fail if the second WCxx method call failed. However, the WQxx method might have succeeded, and potentially allocated memory for the result. Instead of throwing away the result and potentially leaking memory, ignore the result of the second WCxx call.
Signed-off-by: Barnabás Pőcze pobrn@protonmail.com Link: https://lore.kernel.org/r/20210904175450.156801-25-pobrn@protonmail.com Reviewed-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/platform/x86/wmi.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/platform/x86/wmi.c b/drivers/platform/x86/wmi.c index 00d82e8443bdd..da06284c455dc 100644 --- a/drivers/platform/x86/wmi.c +++ b/drivers/platform/x86/wmi.c @@ -289,7 +289,14 @@ struct acpi_buffer *out) * the WQxx method failed - we should disable collection anyway. */ if ((block->flags & ACPI_WMI_EXPENSIVE) && ACPI_SUCCESS(wc_status)) { - status = acpi_execute_simple_method(handle, wc_method, 0); + /* + * Ignore whether this WCxx call succeeds or not since + * the previously executed WQxx method call might have + * succeeded, and returning the failing status code + * of this call would throw away the result of the WQxx + * call, potentially leaking memory. + */ + acpi_execute_simple_method(handle, wc_method, 0); }
return status;