Maor Gottlieb 870201f95f IB/uverbs: Fix NULL pointer dereference during device removal ... As part of ib_uverbs_remove_one which might be triggered upon reset flow, we trigger IB_EVENT_DEVICE_FATAL event to userspace application. If device was removed after uverbs fd was opened but before ib_uverbs_get_context was called, the event file will be accessed before it was allocated, result in NULL pointer dereference: [ 72.325873] BUG: unable to handle kernel NULL pointer dereference at (null) ... [ 72.325984] IP: _raw_spin_lock_irqsave+0x22/0x40 [ 72.327123] Call Trace: [ 72.327168] ib_uverbs_async_handler.isra.8+0x2e/0x160 [ib_uverbs] [ 72.327216] ? synchronize_srcu_expedited+0x27/0x30 [ 72.327269] ib_uverbs_remove_one+0x120/0x2c0 [ib_uverbs] [ 72.327330] ib_unregister_device+0xd0/0x180 [ib_core] [ 72.327373] mlx5_ib_remove+0x74/0x140 [mlx5_ib] [ 72.327422] mlx5_remove_device+0xfb/0x110 [mlx5_core] [ 72.327466] mlx5_unregister_interface+0x3c/0xa0 [mlx5_core] [ 72.327509] mlx5_ib_cleanup+0x10/0x962 [mlx5_ib] [ 72.327546] SyS_delete_module+0x155/0x230 [ 72.328472] ? exit_to_usermode_loop+0x70/0xa6 [ 72.329370] do_syscall_64+0x54/0xc0 [ 72.330262] entry_SYSCALL64_slow_path+0x25/0x25 Fix it by checking that user context was allocated before trigger the event. Fixes: 036b106357 ('IB/uverbs: Enable device removal when there are active user space applications') Signed-off-by: Maor Gottlieb <maorg@mellanox.com> Reviewed-by: Matan Barak <matanb@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>		2017-08-16 12:53:15 -04:00
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core	IB/uverbs: Fix NULL pointer dereference during device removal	2017-08-16 12:53:15 -04:00
hw	iw_cxgb4: fix misuse of integer variable	2017-08-16 11:43:21 -04:00
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