Patch "ALSA: dummy: Disable switching timer backend via sysfs" has been added to the 4.3-stable tree
Subsystems (2)
This is a note to let you know that I've just added the patch titled
ALSA: dummy: Disable switching timer backend via sysfs
to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
alsa-dummy-disable-switching-timer-backend-via-sysfs.patch
and it can be found in the queue-4.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.
Quoted 1 line
From
7ee96216c31aabe1eb42fb91ff50dae9fcd014b2Mon Sep 17 00:00:00 2001
From: Takashi Iwai <[email protected]>
Date: Thu, 28 Jan 2016 07:54:16 +0100
Subject: ALSA: dummy: Disable switching timer backend via sysfs
From: Takashi Iwai <[email protected]>
commit 7ee96216c31aabe1eb42fb91ff50dae9fcd014b2 upstream.
ALSA dummy driver can switch the timer backend between system timer and hrtimer via its hrtimer module option. This can be also switched dynamically via sysfs, but it may lead to a memory corruption when switching is done while a PCM stream is running; the stream instance for the newly switched timer method tries to access the memory that was allocated by another timer method although the sizes differ.
As the simplest fix, this patch just disables the switch via sysfs by dropping the writable bit.
--- sound/drivers/dummy.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
sound/drivers/dummy.c +1 -1
@@ -87,7 +87,7 @@ MODULE_PARM_DESC(pcm_substreams, "PCM sumodule_param (fake_buffer, bool,0444 );MODULE_PARM_DESC (fake_buffer,"Fake buffer allocations." );#ifdef CONFIG_HIGH_RES_TIMERS -module_param (hrtimer, bool,0644 ); +module_param (hrtimer, bool,0444 );MODULE_PARM_DESC (hrtimer,"Use hrtimer as the timer source." );#endif
Patches currently in stable-queue which might be from [email protected] are
queue-4.3/alsa-seq-fix-race-at-closing-in-virmidi-driver.patch queue-4.3/alsa-hda-fix-bad-dereference-of-jack-object.patch queue-4.3/c8sectpfe-remove-select-on-config_fw_loader_user_helper_fallback.patch queue-4.3/alsa-usb-audio-add-quirk-for-microsoft-lifecam-hd-6000.patch queue-4.3/alsa-rawmidi-remove-kernel-warning-for-null-user-space-buffer-check.patch queue-4.3/alsa-usb-audio-fix-oppo-ha-1-vendor-id.patch queue-4.3/alsa-timer-fix-race-at-concurrent-reads.patch queue-4.3/alsa-hda-fix-static-checker-warning-in-patch_hdmi.c.patch queue-4.3/alsa-seq-fix-lockdep-warnings-due-to-double-mutex-locks.patch queue-4.3/alsa-usb-audio-fix-teac-ud-501-ud-503-nt-503-usb-delay.patch queue-4.3/alsa-timer-fix-wrong-instance-passed-to-slave-callbacks.patch queue-4.3/alsa-hda-implement-loopback-control-switch-for-realtek-and-other-codecs.patch queue-4.3/alsa-seq-degrade-the-error-message-for-too-many-opens.patch queue-4.3/alsa-compress-disable-get_codec_caps-ioctl-for-some-architectures.patch queue-4.3/alsa-rawmidi-make-snd_rawmidi_transmit-race-free.patch queue-4.3/alsa-hda-fix-speaker-output-from-vaio-aio-machines.patch queue-4.3/alsa-bebob-use-a-signed-return-type-for-get_formation_index.patch queue-4.3/alsa-dummy-implement-timer-backend-switching-more-safely.patch queue-4.3/alsa-dummy-disable-switching-timer-backend-via-sysfs.patch queue-4.3/alsa-seq-fix-incorrect-sanity-check-at-snd_seq_oss_synth_cleanup.patch queue-4.3/alsa-seq-fix-yet-another-races-among-alsa-timer-accesses.patch queue-4.3/alsa-usb-audio-avoid-freeing-umidi-object-twice.patch queue-4.3/revert-alsa-hda-fix-noise-on-gigabyte-z170x-mobo.patch queue-4.3/alsa-hda-add-fixup-for-mac-mini-7-1-model.patch queue-4.3/alsa-usb-audio-add-native-dsd-support-for-ps-audio-nuwave-dac.patch queue-4.3/alsa-timer-fix-leftover-link-at-closing.patch queue-4.3/alsa-rawmidi-fix-race-at-copying-updating-the-position.patch queue-4.3/alsa-pcm-fix-potential-deadlock-in-oss-emulation.patch queue-4.3/alsa-timer-fix-link-corruption-due-to-double-start-or-stop.patch