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iwlwifi: kernel panic if try to open tid with large index (>=8)

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Hi.

  I have an intel 5300 card running on latest compat-wireless.
  If I do:
echo "tx start 8" >
/sys/kernel/debug/ieee80211/phy0/netdev\:wlan1/stations/XX\:XX\:XX\:XX\:XX\:XX/agg_status
  I get two pages of kernel stack trace and complete freeze, no
messages left in any logs after reboot.
  I looks like driver doesn't correctly check that this tid is
actually supported when it comes from mac80211 layer.
  This doesn't seem like a huge issue, just an annoying one.

  Please let me knoe if I can provide any more information.
  Thanks.

-- 
Truthfully yours,
Martynov Nikolay.
Email: mar.kolya@xxxxxxxxx
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