Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759277Ab2FQSij (ORCPT ); Sun, 17 Jun 2012 14:38:39 -0400 Received: from shadbolt.e.decadent.org.uk ([88.96.1.126]:50185 "EHLO shadbolt.e.decadent.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758034Ab2FQSWf (ORCPT ); Sun, 17 Jun 2012 14:22:35 -0400 Message-Id: <20120617175950.313110534@decadent.org.uk> User-Agent: quilt/0.60-1 Date: Sun, 17 Jun 2012 19:00:43 +0100 From: Ben Hutchings To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Takashi Iwai , Sarah Sharp , Oliver Neukum Subject: [ 62/69] xhci: Dont free endpoints in xhci_mem_cleanup() In-Reply-To: <20120617175941.281333656@decadent.org.uk> X-SA-Exim-Connect-IP: 2001:470:1f08:1539:21c:bfff:fe03:f805 X-SA-Exim-Mail-From: ben@decadent.org.uk X-SA-Exim-Scanned: No (on shadbolt.decadent.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3404 Lines: 99 3.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Takashi Iwai commit 32f1d2c536d0c26c5814cb0e6a0606c42d02fac1 upstream. This patch fixes a few issues introduced in the recent fix [f8a9e72d: USB: fix resource leak in xhci power loss path] - The endpoints listed in bw table are just links and each entry is an array member of dev->eps[]. But the commit above adds a kfree() call to these instances, and thus it results in memory corruption. - It clears only the first entry of rh_bw[], but there can be multiple ports. - It'd be safer to clear the list_head of ep as well, not only removing from the list, as it's checked in xhci_discover_or_reset_device(). This patch should be backported to kernels as old as 3.2, that contain the commit 839c817ce67178ca3c7c7ad534c571bba1e69ebe "xhci: Store information about roothubs and TTs." Signed-off-by: Takashi Iwai Signed-off-by: Sarah Sharp Reviewed-by: Oliver Neukum Signed-off-by: Ben Hutchings --- drivers/usb/host/xhci-mem.c | 35 ++++++++++++++--------------------- 1 file changed, 14 insertions(+), 21 deletions(-) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index 898dfc8..77689bd 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1772,17 +1772,9 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci) { struct pci_dev *pdev = to_pci_dev(xhci_to_hcd(xhci)->self.controller); struct dev_info *dev_info, *next; - struct list_head *tt_list_head; - struct list_head *tt; - struct list_head *endpoints; - struct list_head *ep, *q; - struct xhci_tt_bw_info *tt_info; - struct xhci_interval_bw_table *bwt; - struct xhci_virt_ep *virt_ep; - unsigned long flags; int size; - int i; + int i, j, num_ports; /* Free the Event Ring Segment Table and the actual Event Ring */ size = sizeof(struct xhci_erst_entry)*(xhci->erst.num_entries); @@ -1841,21 +1833,22 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci) } spin_unlock_irqrestore(&xhci->lock, flags); - bwt = &xhci->rh_bw->bw_table; - for (i = 0; i < XHCI_MAX_INTERVAL; i++) { - endpoints = &bwt->interval_bw[i].endpoints; - list_for_each_safe(ep, q, endpoints) { - virt_ep = list_entry(ep, struct xhci_virt_ep, bw_endpoint_list); - list_del(&virt_ep->bw_endpoint_list); - kfree(virt_ep); + num_ports = HCS_MAX_PORTS(xhci->hcs_params1); + for (i = 0; i < num_ports; i++) { + struct xhci_interval_bw_table *bwt = &xhci->rh_bw[i].bw_table; + for (j = 0; j < XHCI_MAX_INTERVAL; j++) { + struct list_head *ep = &bwt->interval_bw[j].endpoints; + while (!list_empty(ep)) + list_del_init(ep->next); } } - tt_list_head = &xhci->rh_bw->tts; - list_for_each_safe(tt, q, tt_list_head) { - tt_info = list_entry(tt, struct xhci_tt_bw_info, tt_list); - list_del(tt); - kfree(tt_info); + for (i = 0; i < num_ports; i++) { + struct xhci_tt_bw_info *tt, *n; + list_for_each_entry_safe(tt, n, &xhci->rh_bw[i].tts, tt_list) { + list_del(&tt->tt_list); + kfree(tt); + } } xhci->num_usb2_ports = 0; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/