13 Apr, 2015
1 commit
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An element instance can have several elements with the same feature.
Some userspace applications can add such an element instance by add
operation with the number of elements. Then, the element instance
gets a memory object to keep states of these elements.But the element instance has just one memory object for the elements.
This causes the same result to each read/write operations to the
different elements.This commit fixes this bug by allocating enough memory objects to the
element instance for each of elements.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
12 Apr, 2015
1 commit
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The commit [39d118677baa: ALSA: ctl: evaluate macro instead of
numerical value] replaced the numbers with constants, but one place
was replaced wrongly with a different type. Fixed now.Fixes: 39d118677baa ('ALSA: ctl: evaluate macro instead of numerical value')
Signed-off-by: Takashi Iwai
11 Apr, 2015
3 commits
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currently some members related identical information are not fiiled
in returned parameter of SNDRV_CTL_IOCTL_ELEM_ADD. This is not better
for userspace application.This commit copies information to returned value. When failing to copy
into userspace, the added elements are going to be removed. Then, no
applications can lock these elements between adding and removing because
these are already locked.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
In operations of SNDRV_CTL_IOCTL_ELEM_INFO, identical information in
returned value is cleared. This is not better to userspace application.This commit confirms to return full identical information to the
operations.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
When event originator doesn't set numerical ID in identical information,
the event data includes no numerical ID, thus userspace applications
cannot identify the control just by unique ID in event data.This commit fix this bug so as the event data includes all of identical
information.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
10 Apr, 2015
1 commit
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SNDRV_CTL_TLV_OP_XXX is defined but not used in core code. Instead,
raw numerical value is evaluated.This commit replaces these values to these macros for better looking.
Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
13 Mar, 2015
1 commit
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In the commit [2225e79b9b03: 'ALSA: core: reduce stack usage related
to snd_ctl_new()'], the id field of the newly added kctl is untouched,
thus all attribute like name string remain empty. The fix is just to
add the forgotten memcpy of the id field.Fixes: 2225e79b9b03 ('ALSA: core: reduce stack usage related to snd_ctl_new()')
Reviewed-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
12 Mar, 2015
2 commits
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There was no check about the id string of user control elements, so we
accepted even a control element with an empty string, which is
obviously bogus. This patch adds more sanity checks of id strings.Cc:
Signed-off-by: Takashi Iwai
10 Mar, 2015
3 commits
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The kernel memory allocators already report the errors when the
requested allocation fails, thus we don't need to warn it again in
each caller side.Signed-off-by: Takashi Iwai
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The callers of snd_ctl_new() need to have 'struct snd_kcontrol' data,
and pass the data as template. Then, the function allocates the structure
data again and copy from the template. This is a waste of resources.
Especially, the callers use large stack for the template.This commit removes a need of template for the function, thus, changes
the prototype of snd_ctl_new(). Furthermore, this commit changes
the code of callers, snd_ctl_new1() and snd_ctl_elem_add() for better
shape.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai -
The parameters can be decided in compile time.
This commit adds precomputed table to reduce calculating time.
Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
09 Feb, 2015
1 commit
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In 'replace' event data, numerical ID of control is always invalid. This
commit fix this bug so as the event data has renewed numerical ID for
control.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
08 Feb, 2015
1 commit
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Currently when adding a new control, the assigned numerical ID is not
set for event data, thus userspace applications cannot realize it just
by event data.Signed-off-by: Takashi Sakamoto
Signed-off-by: Takashi Iwai
03 Feb, 2015
1 commit
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Now that all callers have been replaced with
snd_device_register_for_dev(), let's drop the obsolete device
registration code and concentrate only on the code handling struct
device directly. That said,- remove the old snd_device_register(),
- rename snd_device_register_for_dev() with snd_device_register(),
- drop superfluous arguments from snd_device_register(),
- change snd_unregister_device() to pass the device pointer directlyReviewed-by: Jaroslav Kysela
Signed-off-by: Takashi Iwai
02 Feb, 2015
2 commits
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This patch embeds a struct device for the control device into the card
object and avoid the device creation at registration time.Reviewed-by: Jaroslav Kysela
Signed-off-by: Takashi Iwai -
Instead of open-coding the search over the control file loop, provide
a helper function for the preferred subdevice assigned to the current
process.Reviewed-by: Jaroslav Kysela
Signed-off-by: Takashi Iwai
07 Nov, 2014
1 commit
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We want to know the offset for the id that was passed to the function, not
the offset of the first id of the control (which is always 0).Signed-off-by: Lars-Peter Clausen
Signed-off-by: Takashi Iwai
30 Oct, 2014
1 commit
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A few functions have no proper documentation yet, so let's add them.
Along with it, remove superfluous blank line between the closing brace
and EXPORT_SYMBOL() line.Signed-off-by: Takashi Iwai
21 Oct, 2014
2 commits
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Although this is weird, some drivers want to allow empty control
elements intentionally, e.g. the number of items may change depending
on the firmware status. Let the function simply returning in such a
case.Signed-off-by: Takashi Iwai
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This allows us to catch the bugs in drivers easily.
Signed-off-by: Takashi Iwai
15 Jul, 2014
1 commit
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Instead of hard-coded magic numbers, define constants for op_flag to
tlv callbacks.Signed-off-by: Takashi Iwai
18 Jun, 2014
5 commits
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The ALSA control code expects that the range of assigned indices to a control is
continuous and does not overflow. Currently there are no checks to enforce this.
If a control with a overflowing index range is created that control becomes
effectively inaccessible and unremovable since snd_ctl_find_id() will not be
able to find it. This patch adds a check that makes sure that controls with a
overflowing index range can not be created.Signed-off-by: Lars-Peter Clausen
Acked-by: Jaroslav Kysela
Cc:
Signed-off-by: Takashi Iwai -
Each control gets automatically assigned its numids when the control is created.
The allocation is done by incrementing the numid by the amount of allocated
numids per allocation. This means that excessive creation and destruction of
controls (e.g. via SNDRV_CTL_IOCTL_ELEM_ADD/REMOVE) can cause the id to
eventually overflow. Currently when this happens for the control that caused the
overflow kctl->id.numid + kctl->count will also over flow causing it to be
smaller than kctl->id.numid. Most of the code assumes that this is something
that can not happen, so we need to make sure that it won't happenSigned-off-by: Lars-Peter Clausen
Acked-by: Jaroslav Kysela
Cc:
Signed-off-by: Takashi Iwai -
A control that is visible on the card->controls list can be freed at any time.
This means we must not access any of its memory while not holding the
controls_rw_lock. Otherwise we risk a use after free access.Signed-off-by: Lars-Peter Clausen
Acked-by: Jaroslav Kysela
Cc:
Signed-off-by: Takashi Iwai -
There are two issues with the current implementation for replacing user
controls. The first is that the code does not check if the control is actually a
user control and neither does it check if the control is owned by the process
that tries to remove it. That allows userspace applications to remove arbitrary
controls, which can cause a user after free if a for example a driver does not
expect a control to be removed from under its feed.The second issue is that on one hand when a control is replaced the
user_ctl_count limit is not checked and on the other hand the user_ctl_count is
increased (even though the number of user controls does not change). This allows
userspace, once the user_ctl_count limit as been reached, to repeatedly replace
a control until user_ctl_count overflows. Once that happens new controls can be
added effectively bypassing the user_ctl_count limit.Both issues can be fixed by instead of open-coding the removal of the control
that is to be replaced to use snd_ctl_remove_user_ctl(). This function does
proper permission checks as well as decrements user_ctl_count after the control
has been removed.Note that by using snd_ctl_remove_user_ctl() the check which returns -EBUSY at
beginning of the function if the control already exists is removed. This is not
a problem though since the check is quite useless, because the lock that is
protecting the control list is released between the check and before adding the
new control to the list, which means that it is possible that a different
control with the same settings is added to the list after the check. Luckily
there is another check that is done while holding the lock in snd_ctl_add(), so
we'll rely on that to make sure that the same control is not added twice.Signed-off-by: Lars-Peter Clausen
Acked-by: Jaroslav Kysela
Cc:
Signed-off-by: Takashi Iwai -
The user-control put and get handlers as well as the tlv do not protect against
concurrent access from multiple threads. Since the state of the control is not
updated atomically it is possible that either two write operations or a write
and a read operation race against each other. Both can lead to arbitrary memory
disclosure. This patch introduces a new lock that protects user-controls from
concurrent access. Since applications typically access controls sequentially
than in parallel a single lock per card should be fine.Signed-off-by: Lars-Peter Clausen
Acked-by: Jaroslav Kysela
Cc:
Signed-off-by: Takashi Iwai
14 Feb, 2014
1 commit
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Use dev_err() & co as much as possible. If not available (no device
assigned at the calling point), use pr_xxx() helpers instead.Signed-off-by: Takashi Iwai
10 Feb, 2014
1 commit
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Replace the lengthy #if defined(XXX) || defined(XXX_MODULE) with the
new IS_ENABLED() macro.The patch still doesn't cover all ifdefs. For example, the dependency
on CONFIG_GAMEPORT is still open-coded because this also has an extra
dependency on MODULE. Similarly, an open-coded ifdef in pcm_oss.c and
some sequencer-related stuff are left untouched.Signed-off-by: Takashi Iwai
12 Mar, 2013
1 commit
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script/kernel-doc reports the following type of warnings (when run in verbose
mode):Warning(sound/core/init.c:152): No description found for return value of
'snd_card_create'To fix that:
- add missing descriptions of function return values
- use "Return:" sections to describe those return valuesAlong the way:
- complete some descriptions
- fix some typosSigned-off-by: Yacine Belkadi
Signed-off-by: Takashi Iwai
30 Oct, 2012
2 commits
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When disconnect callback is called, each component should wake up
sleepers and check card->shutdown flag for avoiding the endless sleep
blocking the proper resource release.Cc:
Signed-off-by: Takashi Iwai -
For more strict protection for wild disconnections, a refcount is
introduced to the card instance, and let it up/down when an object is
referred via snd_lookup_*() in the open ops.The free-after-last-close check is also changed to check this refcount
instead of the empty list, too.Reported-by: Matthieu CASTET
Cc:
Signed-off-by: Takashi Iwai
07 Sep, 2012
1 commit
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The SNDRV_CTL_ELEM_ACCESS_VOLATILE bit flag wasn't properly inherited
at creating control elements via snd_ctl_new1().Signed-off-by: Takashi Iwai
13 Mar, 2012
1 commit
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Fixed a trailing white space error detected
in sound/core/control.c by checkpatch.pl script.Signed-off-by: Jeffrin Jose
Signed-off-by: Takashi Iwai
07 Nov, 2011
1 commit
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* 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux: (230 commits)
Revert "tracing: Include module.h in define_trace.h"
irq: don't put module.h into irq.h for tracking irqgen modules.
bluetooth: macroize two small inlines to avoid module.h
ip_vs.h: fix implicit use of module_get/module_put from module.h
nf_conntrack.h: fix up fallout from implicit moduleparam.h presence
include: replace linux/module.h with "struct module" wherever possible
include: convert various register fcns to macros to avoid include chaining
crypto.h: remove unused crypto_tfm_alg_modname() inline
uwb.h: fix implicit use of asm/page.h for PAGE_SIZE
pm_runtime.h: explicitly requires notifier.h
linux/dmaengine.h: fix implicit use of bitmap.h and asm/page.h
miscdevice.h: fix up implicit use of lists and types
stop_machine.h: fix implicit use of smp.h for smp_processor_id
of: fix implicit use of errno.h in include/linux/of.h
of_platform.h: delete needless include
acpi: remove module.h include from platform/aclinux.h
miscdevice.h: delete unnecessary inclusion of module.h
device_cgroup.h: delete needless include
net: sch_generic remove redundant use of
net: inet_timewait_sock doesnt need
...Fix up trivial conflicts (other header files, and removal of the ab3550 mfd driver) in
- drivers/media/dvb/frontends/dibx000_common.c
- drivers/media/video/{mt9m111.c,ov6650.c}
- drivers/mfd/ab3550-core.c
- include/linux/dmaengine.h
06 Nov, 2011
1 commit
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This was introduced by 'ALSA: control: add support for ENUMERATED user
space controls' which adds a u64 variable that gets cast to a pointer:sound/core/control.c: In function 'snd_ctl_elem_init_enum_names':
sound/core/control.c:1089: warning: cast to pointer from integer of different sizeCast to uintptr_t before casting to pointer to avoid the warning.
Signed-off-by: Olof Johansson
[cl: replace long with uintptr_t]
Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai
01 Nov, 2011
1 commit
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Lots of sound drivers were getting module.h via the implicit presence
of it in but we are going to clean that up. So
fix up those users now.Signed-off-by: Paul Gortmaker
09 Oct, 2011
1 commit
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Handling of user control elements was implemented for all types except
ENUMERATED. This type will be needed for the device-specific mixers of
upcoming FireWire drivers.Signed-off-by: Clemens Ladisch
Signed-off-by: Takashi Iwai
24 Aug, 2011
2 commits
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Suppose the ALSA card already has a number of MAX_USER_CONTROLS controls, and
the user wants to replace one, it should not fail at this condition check.Signed-off-by: Lu Guanqun
Signed-off-by: Takashi Iwai -
remove trailing tab on the line.
Signed-off-by: Lu Guanqun
Signed-off-by: Takashi Iwai
