From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 099903B4EA2; Wed, 26 Aug 2026 10:31:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787740283; cv=none; b=oec9tD8eWfNAHUe0rwPIE691bzprXYwldzPnd7qbKAGTKXP3Bixcoib2IidAgjHsi4erOEC/jDAs6IK0W+ey0nKhaz8jXcY9V0j9MFkeumROa85i8hKiYbxWu9dQ4djudVQyw6d+1BGQ3ooGv3t7Rh82/dzBXwfBP1JDU39e27M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787740283; c=relaxed/simple; bh=hqqdGo1QDEs15Pab4lVVBgzRxePexxJRTLJY75HB0yQ=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=HsnYIP1TEZjD2mSyvHaO0BC59Hs2jr8TDWeMrxodPvjlmjzSBDljzG8CydmXQ0WEo8FSBJvBkq8inM3JtfWy3m6z4Pu8kd8LRXipc1/xTG34n9PePde3HEtFPZV9G7SS1FgyJOGU6lmGs2enOA3AxXThMopwoGViETmzDVVgAg0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=n120gcAi; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="n120gcAi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 539261F000E9; Wed, 26 Aug 2026 10:31:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787740281; bh=73vonPPn9IO9l5a62vQPbZUrMDKufTNvKRsL8E3ZvdA=; h=Date:Subject:To:References:From:In-Reply-To; b=n120gcAiR+u2j7jVxV4NxRIpm7w5qFPF2f2z4vbFzeOiQvkaCJnjH0kFQystMDfFG J6VZK7szZ3U8k+U0O4GfFYGYuZMVZdgzmThwnfYDxt8GUWdPWq9ua8p0hy3/18hlQH lZyhuDslQzugbc9AG3j17hjlNFu0+Ez4ENck7eC2OfffBZURkenVzSW4Bjtgm0W8xq 4E7L89rqPWAEWJgsv/LZa5+zXNsX1o+AumJe+0REhQEDVWh5n54tDuiTereWIDLTef ZITRRPISSc6soak2q04W318xMEokmkXqhe/FqkJRmlH2g2fporH6jWABksM5F+FjZB vYPnA8XHiGILw== Message-ID: <2b1371f7-b099-4ce4-a685-89783d0187ba@kernel.org> Date: Wed, 26 Aug 2026 12:31:18 +0200 Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: + usb-gadgetfs-do-not-warn-about-excessively-large-memory-allocations.patch added to mm-nonmm-unstable branch Content-Language: en-US To: Andrew Morton , mm-commits@vger.kernel.org, stern@rowland.harvard.edu, stable@vger.kernel.org, gregkh@linuxfoundation.org, ziy@nvidia.com References: <20260820223719.A4A3C1F000E9@smtp.kernel.org> From: "Vlastimil Babka (SUSE)" Autocrypt: addr=vbabka@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 8/21/26 00:37, Andrew Morton wrote: > The patch titled > Subject: USB: gadgetfs: do not WARN about excessively large memory allocations > has been added to the -mm mm-nonmm-unstable branch. Its filename is > usb-gadgetfs-do-not-warn-about-excessively-large-memory-allocations.patch > > This patch will shortly appear at > https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/usb-gadgetfs-do-not-warn-about-excessively-large-memory-allocations.patch > > This patch will later appear in the mm-nonmm-unstable branch at > git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > > Before you just go and hit "reply", please: > a) Consider who else should be cc'ed > b) Prefer to cc a suitable mailing list as well > c) Ideally: find the original patch on the mailing list and do a > reply-to-all to that, adding suitable additional cc's > > *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** > > The -mm tree is included into linux-next via various > branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm > and is updated there most days > > ------------------------------------------------------ > From: Zi Yan > Subject: USB: gadgetfs: do not WARN about excessively large memory allocations > Date: Thu, 20 Aug 2026 09:19:12 -0400 > > GadgetFS passes an excessively large user input len to kmalloc and kmalloc > gives a WARN (see below for details). Suppress it by passing __GFP_NOWARN > to kmalloc used by both ep_write_iter() and ep_read_iter(). Follow the > same method as commit 4f2629ea67e72 ("USB: usbfs: Don't WARN about > excessively large memory allocations"). > > kmalloc is used to allocate physically contiguous memory for kernel > allocations. For requests larger than KMALLOC_MAX_CACHE_SIZE, kmalloc > uses the page allocator and can only support up to KMALLOC_MAX_SIZE. For > request sizes bigger than KMALLOC_MAX_SIZE, the page allocator can emit a > WARN because kmalloc allocates an order greater than MAX_PAGE_ORDER. > > Link: https://lore.kernel.org/DKTTMAS94IMH.2C6ERY0ZIVWVZ@nvidia.com > Fixes: b3c466ce5129 ("page allocator: do not sanity check order in the fast= > path") > Signed-off-by: Zi Yan > Reported-by: syzbot+805630f1453e490427fa@syzkaller.appspotmail.com > Closes: https://lore.kernel.org/all/6a820ebc.9ebadd4d.20b15e.001b.GAE@googl= > e.com/ > Tested-by: syzbot+805630f1453e490427fa@syzkaller.appspotmail.com > Acked-by: Alan Stern > Cc: Greg Kroah-Hartman > Cc: Vlastimil Babka > Cc: > Signed-off-by: Andrew Morton Acked-by: Vlastimil Babka (SUSE) > --- > > drivers/usb/gadget/legacy/inode.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > --- a/drivers/usb/gadget/legacy/inode.c~usb-gadgetfs-do-not-warn-about-excessively-large-memory-allocations > +++ a/drivers/usb/gadget/legacy/inode.c > @@ -604,7 +604,7 @@ ep_read_iter(struct kiocb *iocb, struct > return -EBADMSG; > } > > - buf = kmalloc(len, GFP_KERNEL); > + buf = kmalloc(len, GFP_KERNEL | __GFP_NOWARN); > if (unlikely(!buf)) { > mutex_unlock(&epdata->lock); > return -ENOMEM; > @@ -666,7 +666,7 @@ ep_write_iter(struct kiocb *iocb, struct > return -EBADMSG; > } > > - buf = kmalloc(len, GFP_KERNEL); > + buf = kmalloc(len, GFP_KERNEL | __GFP_NOWARN); > if (unlikely(!buf)) { > mutex_unlock(&epdata->lock); > return -ENOMEM; > _ > > Patches currently in -mm which might be from ziy@nvidia.com are > > mm-huge_memory-use-folios-memcg-inside-__folio_split.patch > xarray-honor-xa_flags_account-in-xas_split_alloc.patch > usb-gadgetfs-do-not-warn-about-excessively-large-memory-allocations.patch >