On Tue, Feb 14, 2017 at 10:56:30AM -0800, Bart Van Assche wrote: > After srp_process_rsp() returns there is a short time during which > the scsi_host_find_tag() call will return a pointer to the SCSI > command that is being completed. If during that time a duplicate > response is received, avoid that the following call stack appears: > > BUG: unable to handle kernel NULL pointer dereference at (null) > IP: srp_recv_done+0x450/0x6b0 [ib_srp] > Oops: 0000 [#1] SMP > CPU: 10 PID: 0 Comm: swapper/10 Not tainted 4.10.0-rc7-dbg+ #1 > Call Trace: > <IRQ> > __ib_process_cq+0x4b/0xd0 [ib_core] > ib_poll_handler+0x1d/0x70 [ib_core] > irq_poll_softirq+0xba/0x120 > __do_softirq+0xba/0x4c0 > irq_exit+0xbe/0xd0 > smp_apic_timer_interrupt+0x38/0x50 > apic_timer_interrupt+0x90/0xa0 > </IRQ> > RIP: srp_recv_done+0x450/0x6b0 [ib_srp] RSP: ffff88046f483e20 > > Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx> > Cc: Israel Rukshin <israelr@xxxxxxxxxxxx> > Cc: Max Gurtovoy <maxg@xxxxxxxxxxxx> > Cc: Laurence Oberman <loberman@xxxxxxxxxx> > Cc: Steve Feeley <Steve.Feeley@xxxxxxxxxxx> > Cc: <stable@xxxxxxxxxxxxxxx> > --- > drivers/infiniband/ulp/srp/ib_srp.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > Thanks, Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>
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