mac80211: check sta_info_get() return value
ieee80211_stop_rx_ba_session() was calling sta_info_get() without rcu locking, and the return value was not checked. This resulted in the following panic: [<bf05726c>] (ieee80211_stop_rx_ba_session+0x0/0x60 [mac80211]) [<bf0abd94>] (wl1271_event_handle+0x0/0xdc8 [wl12xx]) [<bf0a7308>] (wl1271_irq+0x0/0x4a0 [wl12xx]) [<c00c40a8>] (irq_thread+0x0/0x254) [<c00a7398>] (kthread+0x0/0x8c) Signed-off-by: Eliad Peller <eliad@wizery.com> Reviewed-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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