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 F07D53EAC83; Wed, 20 May 2026 17:37:25 +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=1779298647; cv=none; b=OJU6fucDKm5GEEtFLnELh/udzSmmDcsRk6+w21erN2x//e/G2NNK2G44TbeLjr7Xt1nqvel2KDwIuw50jxQPYdFbRv4VZce+ZWjaGk1qaVDxpf5drd5lREUbzr0MgLHGmHiqW5cPZdDXitFAJzLzcKJM+fVigPBpLK6bQC+VIDM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779298647; c=relaxed/simple; bh=GeRADYgwcRLcP1hRrtqTYP/V6kbf/nUbi6ngrvqmt/Q=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MwUwwaYrRJBdCelnP1Sioof4phT+RRsTAThDnVtO6Dko0/JqFRk16LgzaNarOZg1NTZem36MN7hT5JlWYQxpIUG12IKx8LahIOOpsZI0q0skYRItEW3fq7j+S4A6qshWY6aJ5no5bEm5gvSoVw2rTSpfWCRnbuhd35y4H7d6pic= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Bvn/oNUC; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Bvn/oNUC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 625271F000E9; Wed, 20 May 2026 17:37:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779298645; bh=O2awhu1UU/vDXHxAka9zUEELrlBpSp9a6w2wNbqDHQI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Bvn/oNUCk/GnNnXMoW9/GVfnYfZb/plgHYRqVdrIsk0Mf4UkGACtsSrere44S+8hg PLg/2Q0ueSZn7xD4Fn9d/Rgl4v8aKJlRlFuj6yB1vXwYSfFwxmS2wO310+vnDwRYTB hjwZvbIyppFLLDlv2ww5MOuegxjUqvBfXK7oFUUY= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Oliver Neukum , Jiri Kosina , Sasha Levin Subject: [PATCH 6.18 483/957] HID: usbhid: fix deadlock in hid_post_reset() Date: Wed, 20 May 2026 18:16:06 +0200 Message-ID: <20260520162144.999273350@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162134.554764788@linuxfoundation.org> References: <20260520162134.554764788@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Oliver Neukum [ Upstream commit 8df2c1b47ee3cd50fd454f75c7a7e2ae8a6adf72 ] You can build a USB device that includes a HID component and a storage or UAS component. The components can be reset only together. That means that hid_pre_reset() and hid_post_reset() are in the block IO error handling. Hence no memory allocation used in them may do block IO because the IO can deadlock on the mutex held while resetting a device and calling the interface drivers. Use GFP_NOIO for all allocations in them. Fixes: dc3c78e434690 ("HID: usbhid: Check HID report descriptor contents after device reset") Signed-off-by: Oliver Neukum Signed-off-by: Jiri Kosina Signed-off-by: Sasha Levin --- drivers/hid/usbhid/hid-core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hid/usbhid/hid-core.c b/drivers/hid/usbhid/hid-core.c index 758eb21430cda..df3cc89dfb37f 100644 --- a/drivers/hid/usbhid/hid-core.c +++ b/drivers/hid/usbhid/hid-core.c @@ -1552,7 +1552,7 @@ static int hid_post_reset(struct usb_interface *intf) * configuration descriptors passed, we already know that * the size of the HID report descriptor has not changed. */ - rdesc = kmalloc(hid->dev_rsize, GFP_KERNEL); + rdesc = kmalloc(hid->dev_rsize, GFP_NOIO); if (!rdesc) return -ENOMEM; -- 2.53.0