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path: root/sound/core/control_led.c
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2024-02-28ALSA: control_led: Use guard() for lockingTakashi Iwai
We can simplify the code gracefully with new guard() macro and co for automatic cleanup of locks. A couple of functions that use snd_card_ref() and *_unref() are also cleaned up with a defined class, too. Only the code refactoring, and no functional changes. Signed-off-by: Takashi Iwai <tiwai@suse.de> Link: https://lore.kernel.org/r/20240227085306.9764-25-tiwai@suse.de
2023-08-17ALSA: control: Don't embed ctl_devTakashi Iwai
Embedding the ctl_dev in the snd_card object may result in UAF when the delayed kobj release is used; at the delayed kobj release, it still accesses the struct device itself while the card memory (that embeds the struct device) may be already gone. As a workaround, detach the struct device from the card object by allocating via the new snd_device_alloc() helper. The rest are just replacing ctl_dev access to the pointer. This is based on the fix Curtis posted initially. In this patch, the changes are split and use the new helper function instead. Link: https://lore.kernel.org/r/20230801171928.1460120-1-cujomalainey@chromium.org Reviewed-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Curtis Malainey <cujomalainey@chromium.org> Tested-by: Curtis Malainey <cujomalainey@chromium.org> Link: https://lore.kernel.org/r/20230816160252.23396-3-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-07-20ALSA: control: Introduce unlocked version for snd_ctl_find_*() helpersTakashi Iwai
For reducing the unnecessary use of controls_rwsem in the drivers, this patch adds a new variant for snd_ctl_find_*() helpers: snd_ctl_find_id_locked() and snd_ctl_find_numid_locked() look for a kctl element inside the card->controls_rwsem -- that is, doing the very same as what snd_ctl_find_id() and snd_ctl_find_numid() did until now. snd_ctl_find_id() and snd_ctl_find_numid() remain same, i.e. still unlocked version, but they will be switched to locked version once after all callers are replaced. The patch also replaces the calls of snd_ctl_find_id() and snd_ctl_find_numid() in a few places; all of those are places where we know that the functions are called properly with controls_rwsem held. All others are without rwsem (although they should have been). After this patch, we'll turn on the locking in snd_ctl_find_id() and snd_ctl_find_numid() to be more race-free. Link: https://lore.kernel.org/r/20230718141304.1032-10-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-06-21sound: make all 'class' structures constIvan Orlov
Now that the driver core allows for struct class to be in read-only memory, making all 'class' structures to be declared at build time placing them into read-only memory, instead of having to be dynamically allocated at load time. Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Cc: Ivan Orlov <ivan.orlov0322@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Geoff Levand <geoff@infradead.org> Cc: Thierry Reding <treding@nvidia.com> Cc: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> Cc: alsa-devel@alsa-project.org Suggested-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Ivan Orlov <ivan.orlov0322@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20230620175633.641141-2-gregkh@linuxfoundation.org Signed-off-by: Takashi Iwai <tiwai@suse.de>
2023-01-09ALSA: control-led: use strscpy in set_led_id()Jaroslav Kysela
The use of strncpy() in the set_led_id() was incorrect. The len variable should use 'min(sizeof(buf2) - 1, count)' expression. Use strscpy() function to simplify things and handle the error gracefully. Fixes: a135dfb5de15 ("ALSA: led control - add sysfs kcontrol LED marking layer") Reported-by: yang.yang29@zte.com.cn Link: https://lore.kernel.org/alsa-devel/202301091945513559977@zte.com.cn/ Cc: <stable@vger.kernel.org> Signed-off-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2022-08-02ALSA: control-led: Replace sprintf() with sysfs_emit()Takashi Iwai
For sysfs outputs, it's safer to use a new helper, sysfs_emit(), instead of the raw sprintf() & co. This patch replaces such sprintf() calls with sysfs_emit() while simplifying the open code in list_show(). Link: https://lore.kernel.org/r/20220801165639.26030-4-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-11-23ALSA: led: Use restricted type for iface assignmentTakashi Iwai
Fix a sparse warning that complains about the inconsistent type assignment for iface, which is a restricted type of snd_ctl_elem_iface_t. Fixes: a135dfb5de15 ("ALSA: led control - add sysfs kcontrol LED marking layer") Reported-by: kernel test robot <lkp@intel.com> Reviewed-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/202111201028.xduVYgH5-lkp@intel.com Link: https://lore.kernel.org/r/20211123170247.2962-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-08-13ALSA: core: control_led: use strscpy instead of strlcpyPierre-Louis Bossart
strlcpy is deprecated, use its safe replacement Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com> Reviewed-by: Bard Liao <bard.liao@intel.com> Reviewed-by: Paul Olaru <paul.olaru@oss.nxp.com> Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com> Link: https://lore.kernel.org/r/20210812225904.171529-2-pierre-louis.bossart@linux.intel.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-06-14ALSA: control_led - fix initialization in the mode show callbackJaroslav Kysela
The str variable should be always initialized before use even if the switch covers all cases. This is a minimalistic fix: Assign NULL, the sprintf() may print '(null)' if something is corrupted. Signed-off-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20210614071710.1786866-1-perex@perex.cz Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-06-08Merge branch 'for-linus' into for-nextTakashi Iwai
2021-06-02ALSA: control led: fix memory leak in snd_ctl_led_registerDongliang Mu
The snd_ctl_led_sysfs_add and snd_ctl_led_sysfs_remove should contain the refcount operations in pair. However, snd_ctl_led_sysfs_remove fails to decrease the refcount to zero, which causes device_release never to be invoked. This leads to memory leak to some resources, like struct device_private. In addition, we also free some other similar memory leaks in snd_ctl_led_init/snd_ctl_led_exit. Fix this by replacing device_del to device_unregister in snd_ctl_led_sysfs_remove/snd_ctl_led_init/snd_ctl_led_exit. Note that, when CONFIG_DEBUG_KOBJECT_RELEASE is enabled, put_device will call kobject_release and delay the release of kobject, which will cause use-after-free when the memory backing the kobject is freed at once. Reported-by: syzbot+08a7d8b51ea048a74ffb@syzkaller.appspotmail.com Fixes: a135dfb5de15 ("ALSA: led control - add sysfs kcontrol LED marking layer") Signed-off-by: Dongliang Mu <mudongliangabcd@gmail.com> Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20210602034136.2762497-1-mudongliangabcd@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-05-25ALSA: control_led - use DEVICE_ATTR_*() macroYueHaibing
Use DEVICE_ATTR_*() helper instead of plain DEVICE_ATTR, which makes the code a bit shorter and easier to read. Signed-off-by: YueHaibing <yuehaibing@huawei.com> Reviewed-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Link: https://lore.kernel.org/r/20210523071109.28940-1-yuehaibing@huawei.com Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-04-14ALSA: control_led - fix the stack usage (control element ops)Jaroslav Kysela
It's a bad idea to allocate big structures on the stack. Mark the variables as static and add a note for the locking. Fixes: 22d8de62f11b ("ALSA: control - add generic LED trigger module as the new control layer") Cc: Nathan Chancellor <nathan@kernel.org> Cc: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20210414105858.1937710-1-perex@perex.cz Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-04-09ALSA: control - double free in snd_ctl_led_init()Dan Carpenter
"group - 1" was intended here instead of "group". The current error handling will double free the first item in the array and leak the last item. Fixes: cb17fe0045aa ("ALSA: control - add sysfs support to the LED trigger module") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/YHBJ4frGxErWB182@mwanda Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-04-06ALSA: control - off by one in store_mode()Dan Carpenter
If count is 16 then this will put the NUL terminator one element beyond the end of the array. Fixes: cb17fe0045aa ("ALSA: control - add sysfs support to the LED trigger module") Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Reviewed-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/YGcDOtrimR46vr0k@mwanda Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-04-01ALSA: control led - improve the set_led_id() parserJaroslav Kysela
It may be possible that the string pointer does not move when parsing. Add a code which detects this state and simply break the parser loop in this case. Signed-off-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20210331180725.663623-1-perex@perex.cz Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-30ALSA: led control - add sysfs kcontrol LED marking layerJaroslav Kysela
We need to manage the kcontrol entries association for the LED trigger from the user space. This patch adds a layer to the sysfs tree like: /sys/devices/virtual/sound/ctl-led/mic + card0 | + attach | + detach | ... + card1 + attach ... Operations: attach and detach - amixer style ID is accepted and easy strings for numid and simple names reset - reset all associated kcontrol entries list - list associated kcontrol entries (numid values only) Additional symlinks: /sys/devices/virtual/sound/ctl-led/mic/card0/card -> /sys/class/sound/card0 /sys/class/sound/card0/controlC0/led-mic -> /sys/devices/virtual/sound/ctl-led/mic/card0 Signed-off-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20210317172945.842280-7-perex@perex.cz Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-30ALSA: control - add sysfs support to the LED trigger moduleJaroslav Kysela
Create SYSFS/devices/virtual/sound/ctl-led tree (with SYSFS/class/sound/ctl-led symlink). speaker/ +-- mode +-- brightness mic/ +-- mode +-- brightness Copy the idea from the HDA driver and allow to set the audio LEDs based on the various modes: - follow mute - follow moute (inverted to follow mute) - off - on Also, the actual LED state is exposed. Signed-off-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20210317172945.842280-6-perex@perex.cz Signed-off-by: Takashi Iwai <tiwai@suse.de>
2021-03-30ALSA: control - add generic LED trigger module as the new control layerJaroslav Kysela
The recent laptops have usually two LEDs assigned to reflect the speaker and microphone mute state. This implementation adds a tiny layer on top of the control API which calculates the state for those LEDs using the driver callbacks. Two new access flags are introduced to describe the controls which affects the audio path settings (an easy code change for drivers). The LED resource can be shared with multiple sound cards with this code. The user space controls may be added to the state chain on demand, too. This code should replace the LED code in the HDA driver and add a possibility to easy extend the other drivers (ASoC codecs etc.). Signed-off-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20210317172945.842280-4-perex@perex.cz Signed-off-by: Takashi Iwai <tiwai@suse.de>
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