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| author | Vladimir Murzin <murzin.v@gmail.com> | 2013-04-09 22:33:31 +0400 |
|---|---|---|
| committer | Sarah Sharp <sarah.a.sharp@linux.intel.com> | 2013-05-24 09:14:47 -0700 |
| commit | 88696ae432ce7321540ac53d9caab3de9118b094 (patch) | |
| tree | 37c6e9a1055486cf2e413be5402ef6ae30cdcbbb | |
| parent | 331de00a64e5027365145bdf51da27b9ce15dfd5 (diff) | |
| download | linux-3.10-88696ae432ce7321540ac53d9caab3de9118b094.tar.gz linux-3.10-88696ae432ce7321540ac53d9caab3de9118b094.tar.bz2 linux-3.10-88696ae432ce7321540ac53d9caab3de9118b094.zip | |
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
| -rw-r--r-- | drivers/usb/host/xhci-mem.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index bda2c51a7c7..fbf75e57628 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; |