This is a note to let you know that I've just added the patch titled
xhci: fix list access before init
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
xhci-fix-list-access-before-init.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 88696ae432ce7321540ac53d9caab3de9118b094 Mon Sep 17 00:00:00 2001
From: Vladimir Murzin <murzin.v@xxxxxxxxx>
Date: Tue, 9 Apr 2013 22:33:31 +0400
Subject: xhci: fix list access before init
From: Vladimir Murzin <murzin.v@xxxxxxxxx>
commit 88696ae432ce7321540ac53d9caab3de9118b094 upstream.
If for whatever reason we fall into fail path in xhci_mem_init()
before bw table gets initialized we may access the uninitialized lists
in xhci_mem_cleanup().
Check for bw table before traversing lists in cleanup routine.
This patch should be backported to kernels as old as 3.2, that contain
the commit 839c817ce67178ca3c7c7ad534c571bba1e69ebe "xhci: Store
information about roothubs and TTs."
Reported-by: Sergey Dyasly <dserrg@xxxxxxxxx>
Tested-by: Sergey Dyasly <dserrg@xxxxxxxxx>
Signed-off-by: Vladimir Murzin <murzin.v@xxxxxxxxx>
Signed-off-by: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/host/xhci-mem.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1845,6 +1845,9 @@ void xhci_mem_cleanup(struct xhci_hcd *x
}
spin_unlock_irqrestore(&xhci->lock, flags);
+ if (!xhci->rh_bw)
+ goto no_bw;
+
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;
@@ -1863,6 +1866,7 @@ void xhci_mem_cleanup(struct xhci_hcd *x
}
}
+no_bw:
xhci->num_usb2_ports = 0;
xhci->num_usb3_ports = 0;
xhci->num_active_eps = 0;
Patches currently in stable-queue which might be from murzin.v@xxxxxxxxx are
queue-3.4/xhci-fix-list-access-before-init.patch
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