This is a note to let you know that I've just added the patch titled
ALSA: core: Fix NULL module pointer assignment at card init
to the 5.15-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-core-fix-null-module-pointer-assignment-at-card-init.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 39381fe7394e5eafac76e7e9367e7351138a29c1 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Wed, 22 May 2024 09:04:39 +0200
Subject: ALSA: core: Fix NULL module pointer assignment at card init
From: Takashi Iwai <tiwai@xxxxxxx>
commit 39381fe7394e5eafac76e7e9367e7351138a29c1 upstream.
The commit 81033c6b584b ("ALSA: core: Warn on empty module")
introduced a WARN_ON() for a NULL module pointer passed at snd_card
object creation, and it also wraps the code around it with '#ifdef
MODULE'. This works in most cases, but the devils are always in
details. "MODULE" is defined when the target code (i.e. the sound
core) is built as a module; but this doesn't mean that the caller is
also built-in or not. Namely, when only the sound core is built-in
(CONFIG_SND=y) while the driver is a module (CONFIG_SND_USB_AUDIO=m),
the passed module pointer is ignored even if it's non-NULL, and
card->module remains as NULL. This would result in the missing module
reference up/down at the device open/close, leading to a race with the
code execution after the module removal.
For addressing the bug, move the assignment of card->module again out
of ifdef. The WARN_ON() is still wrapped with ifdef because the
module can be really NULL when all sound drivers are built-in.
Note that we keep 'ifdef MODULE' for WARN_ON(), otherwise it would
lead to a false-positive NULL module check. Admittedly it won't catch
perfectly, i.e. no check is performed when CONFIG_SND=y. But, it's no
real problem as it's only for debugging, and the condition is pretty
rare.
Fixes: 81033c6b584b ("ALSA: core: Warn on empty module")
Reported-by: Xu Yang <xu.yang_2@xxxxxxx>
Closes: https://lore.kernel.org/r/20240520170349.2417900-1-xu.yang_2@xxxxxxx
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Tested-by: Xu Yang <xu.yang_2@xxxxxxx>
Link: https://lore.kernel.org/r/20240522070442.17786-1-tiwai@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/core/init.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -303,8 +303,8 @@ static int snd_card_init(struct snd_card
card->number = idx;
#ifdef MODULE
WARN_ON(!module);
- card->module = module;
#endif
+ card->module = module;
INIT_LIST_HEAD(&card->devices);
init_rwsem(&card->controls_rwsem);
rwlock_init(&card->ctl_files_rwlock);
Patches currently in stable-queue which might be from tiwai@xxxxxxx are
queue-5.15/alsa-fix-deadlocks-with-kctl-removals-at-disconnection.patch
queue-5.15/alsa-core-fix-null-module-pointer-assignment-at-card-init.patch
queue-5.15/alsa-timer-set-lower-bound-of-start-tick-time.patch
