This is a note to let you know that I've just added the patch titled
ALSA: control: Avoid WARN() for symlink errors
to the 6.6-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-control-avoid-warn-for-symlink-errors.patch
and it can be found in the queue-6.6 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 01d8bb57d22bc6d55afbaebf1ee23b5b68395711
Author: Takashi Iwai <tiwai@xxxxxxx>
Date: Mon Dec 9 10:56:12 2024 +0100
ALSA: control: Avoid WARN() for symlink errors
[ Upstream commit b2e538a9827dd04ab5273bf4be8eb2edb84357b0 ]
Using WARN() for showing the error of symlink creations don't give
more information than telling that something goes wrong, since the
usual code path is a lregister callback from each control element
creation. More badly, the use of WARN() rather confuses fuzzer as if
it were serious issues.
This patch downgrades the warning messages to use the normal dev_err()
instead of WARN(). For making it clearer, add the function name to
the prefix, too.
Fixes: a135dfb5de15 ("ALSA: led control - add sysfs kcontrol LED marking layer")
Reported-by: syzbot+4e7919b09c67ffd198ae@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lore.kernel.org/675664c7.050a0220.a30f1.018c.GAE@xxxxxxxxxx
Link: https://patch.msgid.link/20241209095614.4273-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/sound/core/control_led.c b/sound/core/control_led.c
index a78eb48927c7..ba984ed00972 100644
--- a/sound/core/control_led.c
+++ b/sound/core/control_led.c
@@ -688,10 +688,16 @@ static void snd_ctl_led_sysfs_add(struct snd_card *card)
goto cerr;
led->cards[card->number] = led_card;
snprintf(link_name, sizeof(link_name), "led-%s", led->name);
- WARN(sysfs_create_link(&card->ctl_dev->kobj, &led_card->dev.kobj, link_name),
- "can't create symlink to controlC%i device\n", card->number);
- WARN(sysfs_create_link(&led_card->dev.kobj, &card->card_dev.kobj, "card"),
- "can't create symlink to card%i\n", card->number);
+ if (sysfs_create_link(&card->ctl_dev->kobj, &led_card->dev.kobj,
+ link_name))
+ dev_err(card->dev,
+ "%s: can't create symlink to controlC%i device\n",
+ __func__, card->number);
+ if (sysfs_create_link(&led_card->dev.kobj, &card->card_dev.kobj,
+ "card"))
+ dev_err(card->dev,
+ "%s: can't create symlink to card%i\n",
+ __func__, card->number);
continue;
cerr:
