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...
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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 203192840e0b..6bd689d6a138 100644 --- a/drivers/soundwire/intel_init.c +++ b/drivers/soundwire/intel_init.c @@ -162,8 +162,6 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level, return AE_NOT_FOUND; }
- res->handle = handle; - /* * On some Intel platforms, multiple children of the HDAS * device can be found, but only one of them is the SoundWire @@ -174,6 +172,9 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level, if ((adr & GENMASK(31, 28)) >> 28 != SDW_LINK_TYPE) return AE_OK; /* keep going */
+ /* found the correct SoundWire controller */ + res->handle = handle; + /* device found, stop namespace walk */ return AE_CTRL_TERMINATE; }