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57 lines
2.2 KiB
Diff
57 lines
2.2 KiB
Diff
From 7682e399485fe19622b6fd82510b1f4551e48a25 Mon Sep 17 00:00:00 2001
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From: Takashi Iwai <tiwai@suse.de>
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Date: Mon, 2 Oct 2017 14:06:43 +0200
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Subject: [PATCH] ALSA: usx2y: Suppress kernel warning at page allocation
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failures
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The usx2y driver allocates the stream read/write buffers in continuous
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pages depending on the stream setup, and this may spew the kernel
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warning messages with a stack trace like:
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WARNING: CPU: 1 PID: 1846 at mm/page_alloc.c:3883
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__alloc_pages_slowpath+0x1ef2/0x2d70
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Modules linked in:
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CPU: 1 PID: 1846 Comm: kworker/1:2 Not tainted
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....
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It may confuse user as if it were any serious error, although this is
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no fatal error and the driver handles the error case gracefully.
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Since the driver has already some sanity check of the given size (128
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and 256 pages), it can't pass any crazy value. So it's merely page
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fragmentation.
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This patch adds __GFP_NOWARN to each caller for suppressing such
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kernel warnings. The original issue was spotted by syzkaller.
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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/usx2y/usb_stream.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/sound/usb/usx2y/usb_stream.c b/sound/usb/usx2y/usb_stream.c
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index 4dab490807009..e229abd216526 100644
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--- a/sound/usb/usx2y/usb_stream.c
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+++ b/sound/usb/usx2y/usb_stream.c
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@@ -191,7 +191,8 @@ struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
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}
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pg = get_order(read_size);
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- sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
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+ sk->s = (void *) __get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO|
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+ __GFP_NOWARN, pg);
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if (!sk->s) {
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snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
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goto out;
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@@ -211,7 +212,8 @@ struct usb_stream *usb_stream_new(struct usb_stream_kernel *sk,
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pg = get_order(write_size);
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sk->write_page =
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- (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO, pg);
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+ (void *)__get_free_pages(GFP_KERNEL|__GFP_COMP|__GFP_ZERO|
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+ __GFP_NOWARN, pg);
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if (!sk->write_page) {
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snd_printk(KERN_WARNING "couldn't __get_free_pages()\n");
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usb_stream_free(sk);
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