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authorVladimir Murzin <murzin.v@gmail.com>2013-04-09 22:33:31 +0400
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2013-05-24 09:14:47 -0700
commit88696ae432ce7321540ac53d9caab3de9118b094 (patch)
tree37c6e9a1055486cf2e413be5402ef6ae30cdcbbb /drivers/usb
parent331de00a64e5027365145bdf51da27b9ce15dfd5 (diff)
downloadlinux-88696ae432ce7321540ac53d9caab3de9118b094.tar.bz2
xhci: fix list access before init
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@gmail.com> Tested-by: Sergey Dyasly <dserrg@gmail.com> Signed-off-by: Vladimir Murzin <murzin.v@gmail.com> Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/host/xhci-mem.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index bda2c51a7c74..fbf75e57628b 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1827,6 +1827,9 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
}
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;
@@ -1845,6 +1848,7 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
}
}
+no_bw:
xhci->num_usb2_ports = 0;
xhci->num_usb3_ports = 0;
xhci->num_active_eps = 0;