linux-kernel - [PATCH 04/11] usb: xhci-mtk: fix use-after-free of mtk->hcd

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Date:   Fri, 30 Jul 2021 16:49:55 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mathias Nyman <mathias.nyman@...el.com>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: [PATCH 04/11] usb: xhci-mtk: fix use-after-free of mtk->hcd

 BUG: KASAN: use-after-free in usb_hcd_is_primary_hcd+0x38/0x60
 Call trace:
  dump_backtrace+0x0/0x3dc
  show_stack+0x20/0x2c
  dump_stack+0x15c/0x1d4
  print_address_description+0x7c/0x510
  kasan_report+0x164/0x1ac
  __asan_report_load8_noabort+0x44/0x50
  usb_hcd_is_primary_hcd+0x38/0x60
  xhci_mtk_runtime_suspend+0x68/0x148
  pm_generic_runtime_suspend+0x90/0xac
  __rpm_callback+0xb8/0x1f4
  rpm_callback+0x54/0x1d0
  rpm_suspend+0x4e0/0xc84
  __pm_runtime_suspend+0xc4/0x114
  xhci_mtk_probe+0xa58/0xd00

This may happen when probe fails, needn't suspend it synchronously,
fix it by using pm_runtime_put_noidle().

Reported-by: Pi Hsun <pihsun@...gle.com>
Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/usb/host/xhci-mtk.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/host/xhci-mtk.c b/drivers/usb/host/xhci-mtk.c
index 2548976bcf05..cb27569186a0 100644
--- a/drivers/usb/host/xhci-mtk.c
+++ b/drivers/usb/host/xhci-mtk.c
@@ -569,7 +569,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 	xhci_mtk_ldos_disable(mtk);
 
 disable_pm:
-	pm_runtime_put_sync_autosuspend(dev);
+	pm_runtime_put_noidle(dev);
 	pm_runtime_disable(dev);
 	return ret;
 }
-- 
2.18.0