mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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117 lines
4.2 KiB
Diff
117 lines
4.2 KiB
Diff
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From 124751d5e63c823092060074bd0abaae61aaa9c4 Mon Sep 17 00:00:00 2001
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From: Takashi Iwai <tiwai@suse.de>
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Date: Tue, 10 Oct 2017 14:10:32 +0200
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Subject: [PATCH] ALSA: usb-audio: Kill stray URB at exiting
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USB-audio driver may leave a stray URB for the mixer interrupt when it
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exits by some error during probe. This leads to a use-after-free
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error as spotted by syzkaller like:
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==================================================================
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BUG: KASAN: use-after-free in snd_usb_mixer_interrupt+0x604/0x6f0
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Call Trace:
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<IRQ>
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__dump_stack lib/dump_stack.c:16
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dump_stack+0x292/0x395 lib/dump_stack.c:52
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print_address_description+0x78/0x280 mm/kasan/report.c:252
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kasan_report_error mm/kasan/report.c:351
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kasan_report+0x23d/0x350 mm/kasan/report.c:409
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__asan_report_load8_noabort+0x19/0x20 mm/kasan/report.c:430
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snd_usb_mixer_interrupt+0x604/0x6f0 sound/usb/mixer.c:2490
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__usb_hcd_giveback_urb+0x2e0/0x650 drivers/usb/core/hcd.c:1779
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....
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Allocated by task 1484:
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save_stack_trace+0x1b/0x20 arch/x86/kernel/stacktrace.c:59
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save_stack+0x43/0xd0 mm/kasan/kasan.c:447
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set_track mm/kasan/kasan.c:459
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kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
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kmem_cache_alloc_trace+0x11e/0x2d0 mm/slub.c:2772
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kmalloc ./include/linux/slab.h:493
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kzalloc ./include/linux/slab.h:666
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snd_usb_create_mixer+0x145/0x1010 sound/usb/mixer.c:2540
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create_standard_mixer_quirk+0x58/0x80 sound/usb/quirks.c:516
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snd_usb_create_quirk+0x92/0x100 sound/usb/quirks.c:560
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create_composite_quirk+0x1c4/0x3e0 sound/usb/quirks.c:59
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snd_usb_create_quirk+0x92/0x100 sound/usb/quirks.c:560
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usb_audio_probe+0x1040/0x2c10 sound/usb/card.c:618
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....
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Freed by task 1484:
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save_stack_trace+0x1b/0x20 arch/x86/kernel/stacktrace.c:59
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save_stack+0x43/0xd0 mm/kasan/kasan.c:447
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set_track mm/kasan/kasan.c:459
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kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:524
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slab_free_hook mm/slub.c:1390
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slab_free_freelist_hook mm/slub.c:1412
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slab_free mm/slub.c:2988
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kfree+0xf6/0x2f0 mm/slub.c:3919
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snd_usb_mixer_free+0x11a/0x160 sound/usb/mixer.c:2244
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snd_usb_mixer_dev_free+0x36/0x50 sound/usb/mixer.c:2250
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__snd_device_free+0x1ff/0x380 sound/core/device.c:91
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snd_device_free_all+0x8f/0xe0 sound/core/device.c:244
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snd_card_do_free sound/core/init.c:461
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release_card_device+0x47/0x170 sound/core/init.c:181
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device_release+0x13f/0x210 drivers/base/core.c:814
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....
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Actually such a URB is killed properly at disconnection when the
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device gets probed successfully, and what we need is to apply it for
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the error-path, too.
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In this patch, we apply snd_usb_mixer_disconnect() at releasing.
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Also introduce a new flag, disconnected, to struct usb_mixer_interface
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for not performing the disconnection procedure twice.
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Reported-by: Andrey Konovalov <andreyknvl@google.com>
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Tested-by: Andrey Konovalov <andreyknvl@google.com>
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Cc: <stable@vger.kernel.org>
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Signed-off-by: Takashi Iwai <tiwai@suse.de>
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---
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sound/usb/mixer.c | 12 ++++++++++--
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sound/usb/mixer.h | 2 ++
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2 files changed, 12 insertions(+), 2 deletions(-)
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diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
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index 9732edf77f860..91bc8f18791e4 100644
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--- a/sound/usb/mixer.c
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+++ b/sound/usb/mixer.c
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@@ -2234,6 +2234,9 @@ static int parse_audio_unit(struct mixer_build *state, int unitid)
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static void snd_usb_mixer_free(struct usb_mixer_interface *mixer)
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{
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+ /* kill pending URBs */
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+ snd_usb_mixer_disconnect(mixer);
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+
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kfree(mixer->id_elems);
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if (mixer->urb) {
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kfree(mixer->urb->transfer_buffer);
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@@ -2584,8 +2587,13 @@ int snd_usb_create_mixer(struct snd_usb_audio *chip, int ctrlif,
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void snd_usb_mixer_disconnect(struct usb_mixer_interface *mixer)
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{
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- usb_kill_urb(mixer->urb);
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- usb_kill_urb(mixer->rc_urb);
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+ if (mixer->disconnected)
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+ return;
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+ if (mixer->urb)
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+ usb_kill_urb(mixer->urb);
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+ if (mixer->rc_urb)
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+ usb_kill_urb(mixer->rc_urb);
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+ mixer->disconnected = true;
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}
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#ifdef CONFIG_PM
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diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
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index 2b4b067646ab0..545d99b09706b 100644
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--- a/sound/usb/mixer.h
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+++ b/sound/usb/mixer.h
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@@ -22,6 +22,8 @@ struct usb_mixer_interface {
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struct urb *rc_urb;
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struct usb_ctrlrequest *rc_setup_packet;
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u8 rc_buffer[6];
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+
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+ bool disconnected;
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};
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#define MAX_CHANNELS 16 /* max logical channels */
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