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authorTakashi Iwai <tiwai@suse.de>2021-09-30 13:41:14 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-10-27 09:32:37 +0200
commitd050562c8adae0fbdfe62e66c8306ad1efd46046 (patch)
treeca7fcde66d066389b645784a959258356e9fddf6 /sound
parentc67099a5bc53d1a24058ba5afe873f16cd290e16 (diff)
ALSA: seq: Fix a potential UAF by wrong private_free call order
commit 1f8763c59c4ec6254d629fe77c0a52220bd907aa upstream. John Keeping reported and posted a patch for a potential UAF in rawmidi sequencer destruction: the snd_rawmidi_dev_seq_free() may be called after the associated rawmidi object got already freed. After a deeper look, it turned out that the bug is rather the incorrect private_free call order for a snd_seq_device. The snd_seq_device private_free gets called at the release callback of the sequencer device object, while this was rather expected to be executed at the snd_device call chains that runs at the beginning of the whole card-free procedure. It's been broken since the rewrite of sequencer-device binding (although it hasn't surfaced because the sequencer device release happens usually right along with the card device release). This patch corrects the private_free call to be done in the right place, at snd_seq_device_dev_free(). Fixes: 7c37ae5c625a ("ALSA: seq: Rewrite sequencer device binding with standard bus") Reported-and-tested-by: John Keeping <john@metanate.com> Cc: <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20210930114114.8645-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/core/seq/seq_device.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/sound/core/seq/seq_device.c b/sound/core/seq/seq_device.c
index e40a2cba5002..5d16b2079119 100644
--- a/sound/core/seq/seq_device.c
+++ b/sound/core/seq/seq_device.c
@@ -162,6 +162,8 @@ static int snd_seq_device_dev_free(struct snd_device *device)
struct snd_seq_device *dev = device->device_data;
cancel_autoload_drivers();
+ if (dev->private_free)
+ dev->private_free(dev);
put_device(&dev->dev);
return 0;
}
@@ -189,11 +191,7 @@ static int snd_seq_device_dev_disconnect(struct snd_device *device)
static void snd_seq_dev_release(struct device *dev)
{
- struct snd_seq_device *sdev = to_seq_dev(dev);
-
- if (sdev->private_free)
- sdev->private_free(sdev);
- kfree(sdev);
+ kfree(to_seq_dev(dev));
}
/*