Re: [PATCH v2 2/8] IB/srp: Avoid that duplicate responses trigger a kernel bug

[Leon Romanovsky <leon@kernel.org>]

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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@sandisk.com>
> Cc: Israel Rukshin <israelr@mellanox.com>
> Cc: Max Gurtovoy <maxg@mellanox.com>
> Cc: Laurence Oberman <loberman@redhat.com>
> Cc: Steve Feeley <Steve.Feeley@sandisk.com>
> Cc: <stable@vger.kernel.org>
> ---
>  drivers/infiniband/ulp/srp/ib_srp.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>

Thanks,
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>

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