summaryrefslogtreecommitdiffstats
path: root/sound
diff options
context:
space:
mode:
authorTakashi Iwai <tiwai@suse.de>2019-04-16 17:06:33 +0200
committerTakashi Iwai <tiwai@suse.de>2019-04-16 17:06:33 +0200
commit2a3f7221acddfe1caa9ff09b3a8158c39b2fdeac (patch)
treeeeffa65a589bb0dc6316eca30f1d9055446db4e2 /sound
parent8c2f870890fd28e023b0fcf49dcee333f2c8bad7 (diff)
downloadlinux-2a3f7221acddfe1caa9ff09b3a8158c39b2fdeac.tar.bz2
ALSA: core: Fix card races between register and disconnect
There is a small race window in the card disconnection code that allows the registration of another card with the very same card id. This leads to a warning in procfs creation as caught by syzkaller. The problem is that we delete snd_cards and snd_cards_lock entries at the very beginning of the disconnection procedure. This makes the slot available to be assigned for another card object while the disconnection procedure is being processed. Then it becomes possible to issue a procfs registration with the existing file name although we check the conflict beforehand. The fix is simply to move the snd_cards and snd_cards_lock clearances at the end of the disconnection procedure. The references to these entries are merely either from the global proc files like /proc/asound/cards or from the card registration / disconnection, so it should be fine to shift at the very end. Reported-by: syzbot+48df349490c36f9f54ab@syzkaller.appspotmail.com Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/init.c18
1 files changed, 9 insertions, 9 deletions
diff --git a/sound/core/init.c b/sound/core/init.c
index 0c4dc40376a7..079c12d64b0e 100644
--- a/sound/core/init.c
+++ b/sound/core/init.c
@@ -382,14 +382,7 @@ int snd_card_disconnect(struct snd_card *card)
card->shutdown = 1;
spin_unlock(&card->files_lock);
- /* phase 1: disable fops (user space) operations for ALSA API */
- mutex_lock(&snd_card_mutex);
- snd_cards[card->number] = NULL;
- clear_bit(card->number, snd_cards_lock);
- mutex_unlock(&snd_card_mutex);
-
- /* phase 2: replace file->f_op with special dummy operations */
-
+ /* replace file->f_op with special dummy operations */
spin_lock(&card->files_lock);
list_for_each_entry(mfile, &card->files_list, list) {
/* it's critical part, use endless loop */
@@ -405,7 +398,7 @@ int snd_card_disconnect(struct snd_card *card)
}
spin_unlock(&card->files_lock);
- /* phase 3: notify all connected devices about disconnection */
+ /* notify all connected devices about disconnection */
/* at this point, they cannot respond to any calls except release() */
#if IS_ENABLED(CONFIG_SND_MIXER_OSS)
@@ -421,6 +414,13 @@ int snd_card_disconnect(struct snd_card *card)
device_del(&card->card_dev);
card->registered = false;
}
+
+ /* disable fops (user space) operations for ALSA API */
+ mutex_lock(&snd_card_mutex);
+ snd_cards[card->number] = NULL;
+ clear_bit(card->number, snd_cards_lock);
+ mutex_unlock(&snd_card_mutex);
+
#ifdef CONFIG_PM
wake_up(&card->power_sleep);
#endif