From: Libin Yang <libin.yang@intel.com> mainline inclusion from mainline-v5.16-rc7 commit 385f287f9853da402d94278e59f594501c1d1dad category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I947TK CVE: CVE-2021-46926 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- The existing code currently sets a pointer to an ACPI handle before checking that it's actually a SoundWire controller. This can lead to issues where the graph walk continues and eventually fails, but the pointer was set already. This patch changes the logic so that the information provided to the caller is set when a controller is found. Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com> Signed-off-by: Libin Yang <libin.yang@intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Link: https://lore.kernel.org/r/20211221010817.23636-2-yung-chuan.liao@linux.intel... Signed-off-by: Takashi Iwai <tiwai@suse.de> Conflicts: sound/hda/intel-sdw-acpi.c Signed-off-by: Liu Mingrui <liumingrui@huawei.com> --- drivers/soundwire/intel_init.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/soundwire/intel_init.c b/drivers/soundwire/intel_init.c index bc8520eb3..ddd70afd0 100644 --- a/drivers/soundwire/intel_init.c +++ b/drivers/soundwire/intel_init.c @@ -374,8 +374,6 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level, return AE_NOT_FOUND; } - info->handle = handle; - /* * On some Intel platforms, multiple children of the HDAS * device can be found, but only one of them is the SoundWire @@ -386,6 +384,9 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level, if (FIELD_GET(GENMASK(31, 28), adr) != SDW_LINK_TYPE) return AE_OK; /* keep going */ + /* found the correct SoundWire controller */ + info->handle = handle; + /* device found, stop namespace walk */ return AE_CTRL_TERMINATE; } -- 2.25.1